spufs/index
squashfs
sysfs
- sysv-fs
tmpfs
ubifs
ubifs-authentication
+++ /dev/null
-.. SPDX-License-Identifier: GPL-2.0
-
-==================
-SystemV Filesystem
-==================
-
-It implements all of
- - Xenix FS,
- - SystemV/386 FS,
- - Coherent FS.
-
-To install:
-
-* Answer the 'System V and Coherent filesystem support' question with 'y'
- when configuring the kernel.
-* To mount a disk or a partition, use::
-
- mount [-r] -t sysv device mountpoint
-
- The file system type names::
-
- -t sysv
- -t xenix
- -t coherent
-
- may be used interchangeably, but the last two will eventually disappear.
-
-Bugs in the present implementation:
-
-- Coherent FS:
-
- - The "free list interleave" n:m is currently ignored.
- - Only file systems with no filesystem name and no pack name are recognized.
- (See Coherent "man mkfs" for a description of these features.)
-
-- SystemV Release 2 FS:
-
- The superblock is only searched in the blocks 9, 15, 18, which
- corresponds to the beginning of track 1 on floppy disks. No support
- for this FS on hard disk yet.
-
-
-These filesystems are rather similar. Here is a comparison with Minix FS:
-
-* Linux fdisk reports on partitions
-
- - Minix FS 0x81 Linux/Minix
- - Xenix FS ??
- - SystemV FS ??
- - Coherent FS 0x08 AIX bootable
-
-* Size of a block or zone (data allocation unit on disk)
-
- - Minix FS 1024
- - Xenix FS 1024 (also 512 ??)
- - SystemV FS 1024 (also 512 and 2048)
- - Coherent FS 512
-
-* General layout: all have one boot block, one super block and
- separate areas for inodes and for directories/data.
- On SystemV Release 2 FS (e.g. Microport) the first track is reserved and
- all the block numbers (including the super block) are offset by one track.
-
-* Byte ordering of "short" (16 bit entities) on disk:
-
- - Minix FS little endian 0 1
- - Xenix FS little endian 0 1
- - SystemV FS little endian 0 1
- - Coherent FS little endian 0 1
-
- Of course, this affects only the file system, not the data of files on it!
-
-* Byte ordering of "long" (32 bit entities) on disk:
-
- - Minix FS little endian 0 1 2 3
- - Xenix FS little endian 0 1 2 3
- - SystemV FS little endian 0 1 2 3
- - Coherent FS PDP-11 2 3 0 1
-
- Of course, this affects only the file system, not the data of files on it!
-
-* Inode on disk: "short", 0 means non-existent, the root dir ino is:
-
- ================================= ==
- Minix FS 1
- Xenix FS, SystemV FS, Coherent FS 2
- ================================= ==
-
-* Maximum number of hard links to a file:
-
- =========== =========
- Minix FS 250
- Xenix FS ??
- SystemV FS ??
- Coherent FS >=10000
- =========== =========
-
-* Free inode management:
-
- - Minix FS
- a bitmap
- - Xenix FS, SystemV FS, Coherent FS
- There is a cache of a certain number of free inodes in the super-block.
- When it is exhausted, new free inodes are found using a linear search.
-
-* Free block management:
-
- - Minix FS
- a bitmap
- - Xenix FS, SystemV FS, Coherent FS
- Free blocks are organized in a "free list". Maybe a misleading term,
- since it is not true that every free block contains a pointer to
- the next free block. Rather, the free blocks are organized in chunks
- of limited size, and every now and then a free block contains pointers
- to the free blocks pertaining to the next chunk; the first of these
- contains pointers and so on. The list terminates with a "block number"
- 0 on Xenix FS and SystemV FS, with a block zeroed out on Coherent FS.
-
-* Super-block location:
-
- =========== ==========================
- Minix FS block 1 = bytes 1024..2047
- Xenix FS block 1 = bytes 1024..2047
- SystemV FS bytes 512..1023
- Coherent FS block 1 = bytes 512..1023
- =========== ==========================
-
-* Super-block layout:
-
- - Minix FS::
-
- unsigned short s_ninodes;
- unsigned short s_nzones;
- unsigned short s_imap_blocks;
- unsigned short s_zmap_blocks;
- unsigned short s_firstdatazone;
- unsigned short s_log_zone_size;
- unsigned long s_max_size;
- unsigned short s_magic;
-
- - Xenix FS, SystemV FS, Coherent FS::
-
- unsigned short s_firstdatazone;
- unsigned long s_nzones;
- unsigned short s_fzone_count;
- unsigned long s_fzones[NICFREE];
- unsigned short s_finode_count;
- unsigned short s_finodes[NICINOD];
- char s_flock;
- char s_ilock;
- char s_modified;
- char s_rdonly;
- unsigned long s_time;
- short s_dinfo[4]; -- SystemV FS only
- unsigned long s_free_zones;
- unsigned short s_free_inodes;
- short s_dinfo[4]; -- Xenix FS only
- unsigned short s_interleave_m,s_interleave_n; -- Coherent FS only
- char s_fname[6];
- char s_fpack[6];
-
- then they differ considerably:
-
- Xenix FS::
-
- char s_clean;
- char s_fill[371];
- long s_magic;
- long s_type;
-
- SystemV FS::
-
- long s_fill[12 or 14];
- long s_state;
- long s_magic;
- long s_type;
-
- Coherent FS::
-
- unsigned long s_unique;
-
- Note that Coherent FS has no magic.
-
-* Inode layout:
-
- - Minix FS::
-
- unsigned short i_mode;
- unsigned short i_uid;
- unsigned long i_size;
- unsigned long i_time;
- unsigned char i_gid;
- unsigned char i_nlinks;
- unsigned short i_zone[7+1+1];
-
- - Xenix FS, SystemV FS, Coherent FS::
-
- unsigned short i_mode;
- unsigned short i_nlink;
- unsigned short i_uid;
- unsigned short i_gid;
- unsigned long i_size;
- unsigned char i_zone[3*(10+1+1+1)];
- unsigned long i_atime;
- unsigned long i_mtime;
- unsigned long i_ctime;
-
-
-* Regular file data blocks are organized as
-
- - Minix FS:
-
- - 7 direct blocks
- - 1 indirect block (pointers to blocks)
- - 1 double-indirect block (pointer to pointers to blocks)
-
- - Xenix FS, SystemV FS, Coherent FS:
-
- - 10 direct blocks
- - 1 indirect block (pointers to blocks)
- - 1 double-indirect block (pointer to pointers to blocks)
- - 1 triple-indirect block (pointer to pointers to pointers to blocks)
-
-
- =========== ========== ================
- Inode size inodes per block
- =========== ========== ================
- Minix FS 32 32
- Xenix FS 64 16
- SystemV FS 64 16
- Coherent FS 64 8
- =========== ========== ================
-
-* Directory entry on disk
-
- - Minix FS::
-
- unsigned short inode;
- char name[14/30];
-
- - Xenix FS, SystemV FS, Coherent FS::
-
- unsigned short inode;
- char name[14];
-
- =========== ============== =====================
- Dir entry size dir entries per block
- =========== ============== =====================
- Minix FS 16/32 64/32
- Xenix FS 16 64
- SystemV FS 16 64
- Coherent FS 16 32
- =========== ============== =====================
-
-* How to implement symbolic links such that the host fsck doesn't scream:
-
- - Minix FS normal
- - Xenix FS kludge: as regular files with chmod 1000
- - SystemV FS ??
- - Coherent FS kludge: as regular files with chmod 1000
-
-
-Notation: We often speak of a "block" but mean a zone (the allocation unit)
-and not the disk driver's notion of "block".
S: Maintained
F: drivers/platform/x86/system76_acpi.c
-SYSV FILESYSTEM
-S: Orphan
-F: Documentation/filesystems/sysv-fs.rst
-F: fs/sysv/
-F: include/linux/sysv_fs.h
-
TASKSTATS STATISTICS INTERFACE
M: Balbir Singh <bsingharora@gmail.com>
S: Maintained
CONFIG_ROMFS_FS=m
CONFIG_PSTORE=m
CONFIG_PSTORE_COMPRESS=y
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_EROFS_FS_ZIP_LZMA=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_QNX6FS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_EROFS_FS=m
CONFIG_NFS_FS=y
CONFIG_VXFS_FS=m
CONFIG_MINIX_FS=m
CONFIG_ROMFS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_NFS_FS=y
CONFIG_ROOT_NFS=y
CONFIG_VXFS_FS=m
CONFIG_MINIX_FS=m
CONFIG_ROMFS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_NFS_FS=y
CONFIG_ROOT_NFS=y
CONFIG_VXFS_FS=m
CONFIG_MINIX_FS=m
CONFIG_ROMFS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_NFS_FS=y
CONFIG_ROOT_NFS=y
CONFIG_HPFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_ROMFS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_NFS_FS=m
CONFIG_NFSD=m
CONFIG_TMPFS=y
CONFIG_TMPFS_XATTR=y
CONFIG_CONFIGFS_FS=y
-CONFIG_SYSV_FS=y
CONFIG_NFS_FS=m
CONFIG_NFS_V4=m
CONFIG_NFS_V4_1=y
CONFIG_RCU_TRACE=y
CONFIG_RESET_CONTROLLER=y
CONFIG_ROOT_NFS=y
-CONFIG_SYSV_FS=m
CONFIG_SYSVIPC=y
CONFIG_TMPFS=y
CONFIG_UBIFS_FS=y
CONFIG_OMFS_FS=m
CONFIG_QNX4FS_FS=m
CONFIG_ROMFS_FS=m
-CONFIG_SYSV_FS=m
CONFIG_UFS_FS=m
CONFIG_NFS_FS=m
CONFIG_NFS_V3_ACL=y
source "fs/qnx6/Kconfig"
source "fs/romfs/Kconfig"
source "fs/pstore/Kconfig"
-source "fs/sysv/Kconfig"
source "fs/ufs/Kconfig"
source "fs/erofs/Kconfig"
source "fs/vboxsf/Kconfig"
obj-$(CONFIG_LOCKD) += lockd/
obj-$(CONFIG_NLS) += nls/
obj-y += unicode/
-obj-$(CONFIG_SYSV_FS) += sysv/
obj-$(CONFIG_SMBFS) += smb/
obj-$(CONFIG_HPFS_FS) += hpfs/
obj-$(CONFIG_NTFS3_FS) += ntfs3/
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0-only
-config SYSV_FS
- tristate "System V/Xenix/V7/Coherent file system support"
- depends on BLOCK
- select BUFFER_HEAD
- help
- SCO, Xenix and Coherent are commercial Unix systems for Intel
- machines, and Version 7 was used on the DEC PDP-11. Saying Y
- here would allow you to read from their floppies and hard disk
- partitions.
-
- If you have floppies or hard disk partitions like that, it is likely
- that they contain binaries from those other Unix systems; in order
- to run these binaries, you will want to install linux-abi which is
- a set of kernel modules that lets you run SCO, Xenix, Wyse,
- UnixWare, Dell Unix and System V programs under Linux. It is
- available via FTP (user: ftp) from
- <ftp://ftp.openlinux.org/pub/people/hch/linux-abi/>).
- NOTE: that will work only for binaries from Intel-based systems;
- PDP ones will have to wait until somebody ports Linux to -11 ;-)
-
- If you only intend to mount files from some other Unix over the
- network using NFS, you don't need the System V file system support
- (but you need NFS file system support obviously).
-
- Note that this option is generally not needed for floppies, since a
- good portable way to transport files and directories between unixes
- (and even other operating systems) is given by the tar program ("man
- tar" or preferably "info tar"). Note also that this option has
- nothing whatsoever to do with the option "System V IPC". Read about
- the System V file system in
- <file:Documentation/filesystems/sysv-fs.rst>.
- Saying Y here will enlarge your kernel by about 27 KB.
-
- To compile this as a module, choose M here: the module will be called
- sysv.
-
- If you haven't heard about all of this before, it's safe to say N.
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# Makefile for the Linux SystemV/Coherent filesystem routines.
-#
-
-obj-$(CONFIG_SYSV_FS) += sysv.o
-
-sysv-objs := ialloc.o balloc.o inode.o itree.o file.o dir.o \
- namei.o super.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/fs/sysv/balloc.c
- *
- * minix/bitmap.c
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * ext/freelists.c
- * Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
- *
- * xenix/alloc.c
- * Copyright (C) 1992 Doug Evans
- *
- * coh/alloc.c
- * Copyright (C) 1993 Pascal Haible, Bruno Haible
- *
- * sysv/balloc.c
- * Copyright (C) 1993 Bruno Haible
- *
- * This file contains code for allocating/freeing blocks.
- */
-
-#include <linux/buffer_head.h>
-#include <linux/string.h>
-#include "sysv.h"
-
-/* We don't trust the value of
- sb->sv_sbd2->s_tfree = *sb->sv_free_blocks
- but we nevertheless keep it up to date. */
-
-static inline sysv_zone_t *get_chunk(struct super_block *sb, struct buffer_head *bh)
-{
- char *bh_data = bh->b_data;
-
- if (SYSV_SB(sb)->s_type == FSTYPE_SYSV4)
- return (sysv_zone_t*)(bh_data+4);
- else
- return (sysv_zone_t*)(bh_data+2);
-}
-
-/* NOTE NOTE NOTE: nr is a block number _as_ _stored_ _on_ _disk_ */
-
-void sysv_free_block(struct super_block * sb, sysv_zone_t nr)
-{
- struct sysv_sb_info * sbi = SYSV_SB(sb);
- struct buffer_head * bh;
- sysv_zone_t *blocks = sbi->s_bcache;
- unsigned count;
- unsigned block = fs32_to_cpu(sbi, nr);
-
- /*
- * This code does not work at all for AFS (it has a bitmap
- * free list). As AFS is supposed to be read-only no one
- * should call this for an AFS filesystem anyway...
- */
- if (sbi->s_type == FSTYPE_AFS)
- return;
-
- if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
- printk("sysv_free_block: trying to free block not in datazone\n");
- return;
- }
-
- mutex_lock(&sbi->s_lock);
- count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
-
- if (count > sbi->s_flc_size) {
- printk("sysv_free_block: flc_count > flc_size\n");
- mutex_unlock(&sbi->s_lock);
- return;
- }
- /* If the free list head in super-block is full, it is copied
- * into this block being freed, ditto if it's completely empty
- * (applies only on Coherent).
- */
- if (count == sbi->s_flc_size || count == 0) {
- block += sbi->s_block_base;
- bh = sb_getblk(sb, block);
- if (!bh) {
- printk("sysv_free_block: getblk() failed\n");
- mutex_unlock(&sbi->s_lock);
- return;
- }
- memset(bh->b_data, 0, sb->s_blocksize);
- *(__fs16*)bh->b_data = cpu_to_fs16(sbi, count);
- memcpy(get_chunk(sb,bh), blocks, count * sizeof(sysv_zone_t));
- mark_buffer_dirty(bh);
- set_buffer_uptodate(bh);
- brelse(bh);
- count = 0;
- }
- sbi->s_bcache[count++] = nr;
-
- *sbi->s_bcache_count = cpu_to_fs16(sbi, count);
- fs32_add(sbi, sbi->s_free_blocks, 1);
- dirty_sb(sb);
- mutex_unlock(&sbi->s_lock);
-}
-
-sysv_zone_t sysv_new_block(struct super_block * sb)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- unsigned int block;
- sysv_zone_t nr;
- struct buffer_head * bh;
- unsigned count;
-
- mutex_lock(&sbi->s_lock);
- count = fs16_to_cpu(sbi, *sbi->s_bcache_count);
-
- if (count == 0) /* Applies only to Coherent FS */
- goto Enospc;
- nr = sbi->s_bcache[--count];
- if (nr == 0) /* Applies only to Xenix FS, SystemV FS */
- goto Enospc;
-
- block = fs32_to_cpu(sbi, nr);
-
- *sbi->s_bcache_count = cpu_to_fs16(sbi, count);
-
- if (block < sbi->s_firstdatazone || block >= sbi->s_nzones) {
- printk("sysv_new_block: new block %d is not in data zone\n",
- block);
- goto Enospc;
- }
-
- if (count == 0) { /* the last block continues the free list */
- unsigned count;
-
- block += sbi->s_block_base;
- if (!(bh = sb_bread(sb, block))) {
- printk("sysv_new_block: cannot read free-list block\n");
- /* retry this same block next time */
- *sbi->s_bcache_count = cpu_to_fs16(sbi, 1);
- goto Enospc;
- }
- count = fs16_to_cpu(sbi, *(__fs16*)bh->b_data);
- if (count > sbi->s_flc_size) {
- printk("sysv_new_block: free-list block with >flc_size entries\n");
- brelse(bh);
- goto Enospc;
- }
- *sbi->s_bcache_count = cpu_to_fs16(sbi, count);
- memcpy(sbi->s_bcache, get_chunk(sb, bh),
- count * sizeof(sysv_zone_t));
- brelse(bh);
- }
- /* Now the free list head in the superblock is valid again. */
- fs32_add(sbi, sbi->s_free_blocks, -1);
- dirty_sb(sb);
- mutex_unlock(&sbi->s_lock);
- return nr;
-
-Enospc:
- mutex_unlock(&sbi->s_lock);
- return 0;
-}
-
-unsigned long sysv_count_free_blocks(struct super_block * sb)
-{
- struct sysv_sb_info * sbi = SYSV_SB(sb);
- int sb_count;
- int count;
- struct buffer_head * bh = NULL;
- sysv_zone_t *blocks;
- unsigned block;
- int n;
-
- /*
- * This code does not work at all for AFS (it has a bitmap
- * free list). As AFS is supposed to be read-only we just
- * lie and say it has no free block at all.
- */
- if (sbi->s_type == FSTYPE_AFS)
- return 0;
-
- mutex_lock(&sbi->s_lock);
- sb_count = fs32_to_cpu(sbi, *sbi->s_free_blocks);
-
- if (0)
- goto trust_sb;
-
- /* this causes a lot of disk traffic ... */
- count = 0;
- n = fs16_to_cpu(sbi, *sbi->s_bcache_count);
- blocks = sbi->s_bcache;
- while (1) {
- sysv_zone_t zone;
- if (n > sbi->s_flc_size)
- goto E2big;
- zone = 0;
- while (n && (zone = blocks[--n]) != 0)
- count++;
- if (zone == 0)
- break;
-
- block = fs32_to_cpu(sbi, zone);
- if (bh)
- brelse(bh);
-
- if (block < sbi->s_firstdatazone || block >= sbi->s_nzones)
- goto Einval;
- block += sbi->s_block_base;
- bh = sb_bread(sb, block);
- if (!bh)
- goto Eio;
- n = fs16_to_cpu(sbi, *(__fs16*)bh->b_data);
- blocks = get_chunk(sb, bh);
- }
- if (bh)
- brelse(bh);
- if (count != sb_count)
- goto Ecount;
-done:
- mutex_unlock(&sbi->s_lock);
- return count;
-
-Einval:
- printk("sysv_count_free_blocks: new block %d is not in data zone\n",
- block);
- goto trust_sb;
-Eio:
- printk("sysv_count_free_blocks: cannot read free-list block\n");
- goto trust_sb;
-E2big:
- printk("sysv_count_free_blocks: >flc_size entries in free-list block\n");
- if (bh)
- brelse(bh);
-trust_sb:
- count = sb_count;
- goto done;
-Ecount:
- printk("sysv_count_free_blocks: free block count was %d, "
- "correcting to %d\n", sb_count, count);
- if (!sb_rdonly(sb)) {
- *sbi->s_free_blocks = cpu_to_fs32(sbi, count);
- dirty_sb(sb);
- }
- goto done;
-}
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/fs/sysv/dir.c
- *
- * minix/dir.c
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * coh/dir.c
- * Copyright (C) 1993 Pascal Haible, Bruno Haible
- *
- * sysv/dir.c
- * Copyright (C) 1993 Bruno Haible
- *
- * SystemV/Coherent directory handling functions
- */
-
-#include <linux/pagemap.h>
-#include <linux/highmem.h>
-#include <linux/swap.h>
-#include "sysv.h"
-
-static int sysv_readdir(struct file *, struct dir_context *);
-
-const struct file_operations sysv_dir_operations = {
- .llseek = generic_file_llseek,
- .read = generic_read_dir,
- .iterate_shared = sysv_readdir,
- .fsync = generic_file_fsync,
-};
-
-static void dir_commit_chunk(struct folio *folio, loff_t pos, unsigned len)
-{
- struct address_space *mapping = folio->mapping;
- struct inode *dir = mapping->host;
-
- block_write_end(NULL, mapping, pos, len, len, folio, NULL);
- if (pos+len > dir->i_size) {
- i_size_write(dir, pos+len);
- mark_inode_dirty(dir);
- }
- folio_unlock(folio);
-}
-
-static int sysv_handle_dirsync(struct inode *dir)
-{
- int err;
-
- err = filemap_write_and_wait(dir->i_mapping);
- if (!err)
- err = sync_inode_metadata(dir, 1);
- return err;
-}
-
-/*
- * Calls to dir_get_folio()/folio_release_kmap() must be nested according to the
- * rules documented in mm/highmem.rst.
- *
- * NOTE: sysv_find_entry() and sysv_dotdot() act as calls to dir_get_folio()
- * and must be treated accordingly for nesting purposes.
- */
-static void *dir_get_folio(struct inode *dir, unsigned long n,
- struct folio **foliop)
-{
- struct folio *folio = read_mapping_folio(dir->i_mapping, n, NULL);
-
- if (IS_ERR(folio))
- return ERR_CAST(folio);
- *foliop = folio;
- return kmap_local_folio(folio, 0);
-}
-
-static int sysv_readdir(struct file *file, struct dir_context *ctx)
-{
- unsigned long pos = ctx->pos;
- struct inode *inode = file_inode(file);
- struct super_block *sb = inode->i_sb;
- unsigned long npages = dir_pages(inode);
- unsigned offset;
- unsigned long n;
-
- ctx->pos = pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);
- if (pos >= inode->i_size)
- return 0;
-
- offset = pos & ~PAGE_MASK;
- n = pos >> PAGE_SHIFT;
-
- for ( ; n < npages; n++, offset = 0) {
- char *kaddr, *limit;
- struct sysv_dir_entry *de;
- struct folio *folio;
-
- kaddr = dir_get_folio(inode, n, &folio);
- if (IS_ERR(kaddr))
- continue;
- de = (struct sysv_dir_entry *)(kaddr+offset);
- limit = kaddr + PAGE_SIZE - SYSV_DIRSIZE;
- for ( ;(char*)de <= limit; de++, ctx->pos += sizeof(*de)) {
- char *name = de->name;
-
- if (!de->inode)
- continue;
-
- if (!dir_emit(ctx, name, strnlen(name,SYSV_NAMELEN),
- fs16_to_cpu(SYSV_SB(sb), de->inode),
- DT_UNKNOWN)) {
- folio_release_kmap(folio, kaddr);
- return 0;
- }
- }
- folio_release_kmap(folio, kaddr);
- }
- return 0;
-}
-
-/* compare strings: name[0..len-1] (not zero-terminated) and
- * buffer[0..] (filled with zeroes up to buffer[0..maxlen-1])
- */
-static inline int namecompare(int len, int maxlen,
- const char * name, const char * buffer)
-{
- if (len < maxlen && buffer[len])
- return 0;
- return !memcmp(name, buffer, len);
-}
-
-/*
- * sysv_find_entry()
- *
- * finds an entry in the specified directory with the wanted name.
- * It does NOT read the inode of the
- * entry - you'll have to do that yourself if you want to.
- *
- * On Success folio_release_kmap() should be called on *foliop.
- *
- * sysv_find_entry() acts as a call to dir_get_folio() and must be treated
- * accordingly for nesting purposes.
- */
-struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct folio **foliop)
-{
- const char * name = dentry->d_name.name;
- int namelen = dentry->d_name.len;
- struct inode * dir = d_inode(dentry->d_parent);
- unsigned long start, n;
- unsigned long npages = dir_pages(dir);
- struct sysv_dir_entry *de;
-
- start = SYSV_I(dir)->i_dir_start_lookup;
- if (start >= npages)
- start = 0;
- n = start;
-
- do {
- char *kaddr = dir_get_folio(dir, n, foliop);
-
- if (!IS_ERR(kaddr)) {
- de = (struct sysv_dir_entry *)kaddr;
- kaddr += folio_size(*foliop) - SYSV_DIRSIZE;
- for ( ; (char *) de <= kaddr ; de++) {
- if (!de->inode)
- continue;
- if (namecompare(namelen, SYSV_NAMELEN,
- name, de->name))
- goto found;
- }
- folio_release_kmap(*foliop, kaddr);
- }
-
- if (++n >= npages)
- n = 0;
- } while (n != start);
-
- return NULL;
-
-found:
- SYSV_I(dir)->i_dir_start_lookup = n;
- return de;
-}
-
-int sysv_add_link(struct dentry *dentry, struct inode *inode)
-{
- struct inode *dir = d_inode(dentry->d_parent);
- const char * name = dentry->d_name.name;
- int namelen = dentry->d_name.len;
- struct folio *folio = NULL;
- struct sysv_dir_entry * de;
- unsigned long npages = dir_pages(dir);
- unsigned long n;
- char *kaddr;
- loff_t pos;
- int err;
-
- /* We take care of directory expansion in the same loop */
- for (n = 0; n <= npages; n++) {
- kaddr = dir_get_folio(dir, n, &folio);
- if (IS_ERR(kaddr))
- return PTR_ERR(kaddr);
- de = (struct sysv_dir_entry *)kaddr;
- kaddr += PAGE_SIZE - SYSV_DIRSIZE;
- while ((char *)de <= kaddr) {
- if (!de->inode)
- goto got_it;
- err = -EEXIST;
- if (namecompare(namelen, SYSV_NAMELEN, name, de->name))
- goto out_folio;
- de++;
- }
- folio_release_kmap(folio, kaddr);
- }
- BUG();
- return -EINVAL;
-
-got_it:
- pos = folio_pos(folio) + offset_in_folio(folio, de);
- folio_lock(folio);
- err = sysv_prepare_chunk(folio, pos, SYSV_DIRSIZE);
- if (err)
- goto out_unlock;
- memcpy (de->name, name, namelen);
- memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
- de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
- dir_commit_chunk(folio, pos, SYSV_DIRSIZE);
- inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
- mark_inode_dirty(dir);
- err = sysv_handle_dirsync(dir);
-out_folio:
- folio_release_kmap(folio, kaddr);
- return err;
-out_unlock:
- folio_unlock(folio);
- goto out_folio;
-}
-
-int sysv_delete_entry(struct sysv_dir_entry *de, struct folio *folio)
-{
- struct inode *inode = folio->mapping->host;
- loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
- int err;
-
- folio_lock(folio);
- err = sysv_prepare_chunk(folio, pos, SYSV_DIRSIZE);
- if (err) {
- folio_unlock(folio);
- return err;
- }
- de->inode = 0;
- dir_commit_chunk(folio, pos, SYSV_DIRSIZE);
- inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
- mark_inode_dirty(inode);
- return sysv_handle_dirsync(inode);
-}
-
-int sysv_make_empty(struct inode *inode, struct inode *dir)
-{
- struct folio *folio = filemap_grab_folio(inode->i_mapping, 0);
- struct sysv_dir_entry * de;
- char *kaddr;
- int err;
-
- if (IS_ERR(folio))
- return PTR_ERR(folio);
- err = sysv_prepare_chunk(folio, 0, 2 * SYSV_DIRSIZE);
- if (err) {
- folio_unlock(folio);
- goto fail;
- }
- kaddr = kmap_local_folio(folio, 0);
- memset(kaddr, 0, folio_size(folio));
-
- de = (struct sysv_dir_entry *)kaddr;
- de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
- strcpy(de->name,".");
- de++;
- de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
- strcpy(de->name,"..");
-
- kunmap_local(kaddr);
- dir_commit_chunk(folio, 0, 2 * SYSV_DIRSIZE);
- err = sysv_handle_dirsync(inode);
-fail:
- folio_put(folio);
- return err;
-}
-
-/*
- * routine to check that the specified directory is empty (for rmdir)
- */
-int sysv_empty_dir(struct inode * inode)
-{
- struct super_block *sb = inode->i_sb;
- struct folio *folio = NULL;
- unsigned long i, npages = dir_pages(inode);
- char *kaddr;
-
- for (i = 0; i < npages; i++) {
- struct sysv_dir_entry *de;
-
- kaddr = dir_get_folio(inode, i, &folio);
- if (IS_ERR(kaddr))
- continue;
-
- de = (struct sysv_dir_entry *)kaddr;
- kaddr += folio_size(folio) - SYSV_DIRSIZE;
-
- for ( ;(char *)de <= kaddr; de++) {
- if (!de->inode)
- continue;
- /* check for . and .. */
- if (de->name[0] != '.')
- goto not_empty;
- if (!de->name[1]) {
- if (de->inode == cpu_to_fs16(SYSV_SB(sb),
- inode->i_ino))
- continue;
- goto not_empty;
- }
- if (de->name[1] != '.' || de->name[2])
- goto not_empty;
- }
- folio_release_kmap(folio, kaddr);
- }
- return 1;
-
-not_empty:
- folio_release_kmap(folio, kaddr);
- return 0;
-}
-
-/* Releases the page */
-int sysv_set_link(struct sysv_dir_entry *de, struct folio *folio,
- struct inode *inode)
-{
- struct inode *dir = folio->mapping->host;
- loff_t pos = folio_pos(folio) + offset_in_folio(folio, de);
- int err;
-
- folio_lock(folio);
- err = sysv_prepare_chunk(folio, pos, SYSV_DIRSIZE);
- if (err) {
- folio_unlock(folio);
- return err;
- }
- de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
- dir_commit_chunk(folio, pos, SYSV_DIRSIZE);
- inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
- mark_inode_dirty(dir);
- return sysv_handle_dirsync(inode);
-}
-
-/*
- * Calls to dir_get_folio()/folio_release_kmap() must be nested according to the
- * rules documented in mm/highmem.rst.
- *
- * sysv_dotdot() acts as a call to dir_get_folio() and must be treated
- * accordingly for nesting purposes.
- */
-struct sysv_dir_entry *sysv_dotdot(struct inode *dir, struct folio **foliop)
-{
- struct sysv_dir_entry *de = dir_get_folio(dir, 0, foliop);
-
- if (IS_ERR(de))
- return NULL;
- /* ".." is the second directory entry */
- return de + 1;
-}
-
-ino_t sysv_inode_by_name(struct dentry *dentry)
-{
- struct folio *folio;
- struct sysv_dir_entry *de = sysv_find_entry (dentry, &folio);
- ino_t res = 0;
-
- if (de) {
- res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);
- folio_release_kmap(folio, de);
- }
- return res;
-}
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/fs/sysv/file.c
- *
- * minix/file.c
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * coh/file.c
- * Copyright (C) 1993 Pascal Haible, Bruno Haible
- *
- * sysv/file.c
- * Copyright (C) 1993 Bruno Haible
- *
- * SystemV/Coherent regular file handling primitives
- */
-
-#include "sysv.h"
-
-/*
- * We have mostly NULLs here: the current defaults are OK for
- * the coh filesystem.
- */
-const struct file_operations sysv_file_operations = {
- .llseek = generic_file_llseek,
- .read_iter = generic_file_read_iter,
- .write_iter = generic_file_write_iter,
- .mmap = generic_file_mmap,
- .fsync = generic_file_fsync,
- .splice_read = filemap_splice_read,
-};
-
-static int sysv_setattr(struct mnt_idmap *idmap,
- struct dentry *dentry, struct iattr *attr)
-{
- struct inode *inode = d_inode(dentry);
- int error;
-
- error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
- if (error)
- return error;
-
- if ((attr->ia_valid & ATTR_SIZE) &&
- attr->ia_size != i_size_read(inode)) {
- error = inode_newsize_ok(inode, attr->ia_size);
- if (error)
- return error;
- truncate_setsize(inode, attr->ia_size);
- sysv_truncate(inode);
- }
-
- setattr_copy(&nop_mnt_idmap, inode, attr);
- mark_inode_dirty(inode);
- return 0;
-}
-
-const struct inode_operations sysv_file_inode_operations = {
- .setattr = sysv_setattr,
- .getattr = sysv_getattr,
-};
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/fs/sysv/ialloc.c
- *
- * minix/bitmap.c
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * ext/freelists.c
- * Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
- *
- * xenix/alloc.c
- * Copyright (C) 1992 Doug Evans
- *
- * coh/alloc.c
- * Copyright (C) 1993 Pascal Haible, Bruno Haible
- *
- * sysv/ialloc.c
- * Copyright (C) 1993 Bruno Haible
- *
- * This file contains code for allocating/freeing inodes.
- */
-
-#include <linux/kernel.h>
-#include <linux/stddef.h>
-#include <linux/sched.h>
-#include <linux/stat.h>
-#include <linux/string.h>
-#include <linux/buffer_head.h>
-#include <linux/writeback.h>
-#include "sysv.h"
-
-/* We don't trust the value of
- sb->sv_sbd2->s_tinode = *sb->sv_sb_total_free_inodes
- but we nevertheless keep it up to date. */
-
-/* An inode on disk is considered free if both i_mode == 0 and i_nlink == 0. */
-
-/* return &sb->sv_sb_fic_inodes[i] = &sbd->s_inode[i]; */
-static inline sysv_ino_t *
-sv_sb_fic_inode(struct super_block * sb, unsigned int i)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
-
- if (sbi->s_bh1 == sbi->s_bh2)
- return &sbi->s_sb_fic_inodes[i];
- else {
- /* 512 byte Xenix FS */
- unsigned int offset = offsetof(struct xenix_super_block, s_inode[i]);
- if (offset < 512)
- return (sysv_ino_t*)(sbi->s_sbd1 + offset);
- else
- return (sysv_ino_t*)(sbi->s_sbd2 + offset);
- }
-}
-
-struct sysv_inode *
-sysv_raw_inode(struct super_block *sb, unsigned ino, struct buffer_head **bh)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- struct sysv_inode *res;
- int block = sbi->s_firstinodezone + sbi->s_block_base;
-
- block += (ino-1) >> sbi->s_inodes_per_block_bits;
- *bh = sb_bread(sb, block);
- if (!*bh)
- return NULL;
- res = (struct sysv_inode *)(*bh)->b_data;
- return res + ((ino-1) & sbi->s_inodes_per_block_1);
-}
-
-static int refill_free_cache(struct super_block *sb)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- struct buffer_head * bh;
- struct sysv_inode * raw_inode;
- int i = 0, ino;
-
- ino = SYSV_ROOT_INO+1;
- raw_inode = sysv_raw_inode(sb, ino, &bh);
- if (!raw_inode)
- goto out;
- while (ino <= sbi->s_ninodes) {
- if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0) {
- *sv_sb_fic_inode(sb,i++) = cpu_to_fs16(SYSV_SB(sb), ino);
- if (i == sbi->s_fic_size)
- break;
- }
- if ((ino++ & sbi->s_inodes_per_block_1) == 0) {
- brelse(bh);
- raw_inode = sysv_raw_inode(sb, ino, &bh);
- if (!raw_inode)
- goto out;
- } else
- raw_inode++;
- }
- brelse(bh);
-out:
- return i;
-}
-
-void sysv_free_inode(struct inode * inode)
-{
- struct super_block *sb = inode->i_sb;
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- unsigned int ino;
- struct buffer_head * bh;
- struct sysv_inode * raw_inode;
- unsigned count;
-
- sb = inode->i_sb;
- ino = inode->i_ino;
- if (ino <= SYSV_ROOT_INO || ino > sbi->s_ninodes) {
- printk("sysv_free_inode: inode 0,1,2 or nonexistent inode\n");
- return;
- }
- raw_inode = sysv_raw_inode(sb, ino, &bh);
- if (!raw_inode) {
- printk("sysv_free_inode: unable to read inode block on device "
- "%s\n", inode->i_sb->s_id);
- return;
- }
- mutex_lock(&sbi->s_lock);
- count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
- if (count < sbi->s_fic_size) {
- *sv_sb_fic_inode(sb,count++) = cpu_to_fs16(sbi, ino);
- *sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
- }
- fs16_add(sbi, sbi->s_sb_total_free_inodes, 1);
- dirty_sb(sb);
- memset(raw_inode, 0, sizeof(struct sysv_inode));
- mark_buffer_dirty(bh);
- mutex_unlock(&sbi->s_lock);
- brelse(bh);
-}
-
-struct inode * sysv_new_inode(const struct inode * dir, umode_t mode)
-{
- struct super_block *sb = dir->i_sb;
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- struct inode *inode;
- sysv_ino_t ino;
- unsigned count;
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_NONE
- };
-
- inode = new_inode(sb);
- if (!inode)
- return ERR_PTR(-ENOMEM);
-
- mutex_lock(&sbi->s_lock);
- count = fs16_to_cpu(sbi, *sbi->s_sb_fic_count);
- if (count == 0 || (*sv_sb_fic_inode(sb,count-1) == 0)) {
- count = refill_free_cache(sb);
- if (count == 0) {
- iput(inode);
- mutex_unlock(&sbi->s_lock);
- return ERR_PTR(-ENOSPC);
- }
- }
- /* Now count > 0. */
- ino = *sv_sb_fic_inode(sb,--count);
- *sbi->s_sb_fic_count = cpu_to_fs16(sbi, count);
- fs16_add(sbi, sbi->s_sb_total_free_inodes, -1);
- dirty_sb(sb);
- inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
- inode->i_ino = fs16_to_cpu(sbi, ino);
- simple_inode_init_ts(inode);
- inode->i_blocks = 0;
- memset(SYSV_I(inode)->i_data, 0, sizeof(SYSV_I(inode)->i_data));
- SYSV_I(inode)->i_dir_start_lookup = 0;
- insert_inode_hash(inode);
- mark_inode_dirty(inode);
-
- sysv_write_inode(inode, &wbc); /* ensure inode not allocated again */
- mark_inode_dirty(inode); /* cleared by sysv_write_inode() */
- /* That's it. */
- mutex_unlock(&sbi->s_lock);
- return inode;
-}
-
-unsigned long sysv_count_free_inodes(struct super_block * sb)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- struct buffer_head * bh;
- struct sysv_inode * raw_inode;
- int ino, count, sb_count;
-
- mutex_lock(&sbi->s_lock);
-
- sb_count = fs16_to_cpu(sbi, *sbi->s_sb_total_free_inodes);
-
- if (0)
- goto trust_sb;
-
- /* this causes a lot of disk traffic ... */
- count = 0;
- ino = SYSV_ROOT_INO+1;
- raw_inode = sysv_raw_inode(sb, ino, &bh);
- if (!raw_inode)
- goto Eio;
- while (ino <= sbi->s_ninodes) {
- if (raw_inode->i_mode == 0 && raw_inode->i_nlink == 0)
- count++;
- if ((ino++ & sbi->s_inodes_per_block_1) == 0) {
- brelse(bh);
- raw_inode = sysv_raw_inode(sb, ino, &bh);
- if (!raw_inode)
- goto Eio;
- } else
- raw_inode++;
- }
- brelse(bh);
- if (count != sb_count)
- goto Einval;
-out:
- mutex_unlock(&sbi->s_lock);
- return count;
-
-Einval:
- printk("sysv_count_free_inodes: "
- "free inode count was %d, correcting to %d\n",
- sb_count, count);
- if (!sb_rdonly(sb)) {
- *sbi->s_sb_total_free_inodes = cpu_to_fs16(SYSV_SB(sb), count);
- dirty_sb(sb);
- }
- goto out;
-
-Eio:
- printk("sysv_count_free_inodes: unable to read inode table\n");
-trust_sb:
- count = sb_count;
- goto out;
-}
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/fs/sysv/inode.c
- *
- * minix/inode.c
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * xenix/inode.c
- * Copyright (C) 1992 Doug Evans
- *
- * coh/inode.c
- * Copyright (C) 1993 Pascal Haible, Bruno Haible
- *
- * sysv/inode.c
- * Copyright (C) 1993 Paul B. Monday
- *
- * sysv/inode.c
- * Copyright (C) 1993 Bruno Haible
- * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
- *
- * This file contains code for allocating/freeing inodes and for read/writing
- * the superblock.
- */
-
-#include <linux/highuid.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/buffer_head.h>
-#include <linux/vfs.h>
-#include <linux/writeback.h>
-#include <linux/namei.h>
-#include <asm/byteorder.h>
-#include "sysv.h"
-
-static int sysv_sync_fs(struct super_block *sb, int wait)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- u32 time = (u32)ktime_get_real_seconds(), old_time;
-
- mutex_lock(&sbi->s_lock);
-
- /*
- * If we are going to write out the super block,
- * then attach current time stamp.
- * But if the filesystem was marked clean, keep it clean.
- */
- old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
- if (sbi->s_type == FSTYPE_SYSV4) {
- if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38u - old_time))
- *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38u - time);
- *sbi->s_sb_time = cpu_to_fs32(sbi, time);
- mark_buffer_dirty(sbi->s_bh2);
- }
-
- mutex_unlock(&sbi->s_lock);
-
- return 0;
-}
-
-static int sysv_remount(struct super_block *sb, int *flags, char *data)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
-
- sync_filesystem(sb);
- if (sbi->s_forced_ro)
- *flags |= SB_RDONLY;
- return 0;
-}
-
-static void sysv_put_super(struct super_block *sb)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
-
- if (!sb_rdonly(sb)) {
- /* XXX ext2 also updates the state here */
- mark_buffer_dirty(sbi->s_bh1);
- if (sbi->s_bh1 != sbi->s_bh2)
- mark_buffer_dirty(sbi->s_bh2);
- }
-
- brelse(sbi->s_bh1);
- if (sbi->s_bh1 != sbi->s_bh2)
- brelse(sbi->s_bh2);
-
- kfree(sbi);
-}
-
-static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
- struct super_block *sb = dentry->d_sb;
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
-
- buf->f_type = sb->s_magic;
- buf->f_bsize = sb->s_blocksize;
- buf->f_blocks = sbi->s_ndatazones;
- buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb);
- buf->f_files = sbi->s_ninodes;
- buf->f_ffree = sysv_count_free_inodes(sb);
- buf->f_namelen = SYSV_NAMELEN;
- buf->f_fsid = u64_to_fsid(id);
- return 0;
-}
-
-/*
- * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32
- */
-static inline void read3byte(struct sysv_sb_info *sbi,
- unsigned char * from, unsigned char * to)
-{
- if (sbi->s_bytesex == BYTESEX_PDP) {
- to[0] = from[0];
- to[1] = 0;
- to[2] = from[1];
- to[3] = from[2];
- } else if (sbi->s_bytesex == BYTESEX_LE) {
- to[0] = from[0];
- to[1] = from[1];
- to[2] = from[2];
- to[3] = 0;
- } else {
- to[0] = 0;
- to[1] = from[0];
- to[2] = from[1];
- to[3] = from[2];
- }
-}
-
-static inline void write3byte(struct sysv_sb_info *sbi,
- unsigned char * from, unsigned char * to)
-{
- if (sbi->s_bytesex == BYTESEX_PDP) {
- to[0] = from[0];
- to[1] = from[2];
- to[2] = from[3];
- } else if (sbi->s_bytesex == BYTESEX_LE) {
- to[0] = from[0];
- to[1] = from[1];
- to[2] = from[2];
- } else {
- to[0] = from[1];
- to[1] = from[2];
- to[2] = from[3];
- }
-}
-
-static const struct inode_operations sysv_symlink_inode_operations = {
- .get_link = page_get_link,
- .getattr = sysv_getattr,
-};
-
-void sysv_set_inode(struct inode *inode, dev_t rdev)
-{
- if (S_ISREG(inode->i_mode)) {
- inode->i_op = &sysv_file_inode_operations;
- inode->i_fop = &sysv_file_operations;
- inode->i_mapping->a_ops = &sysv_aops;
- } else if (S_ISDIR(inode->i_mode)) {
- inode->i_op = &sysv_dir_inode_operations;
- inode->i_fop = &sysv_dir_operations;
- inode->i_mapping->a_ops = &sysv_aops;
- } else if (S_ISLNK(inode->i_mode)) {
- inode->i_op = &sysv_symlink_inode_operations;
- inode_nohighmem(inode);
- inode->i_mapping->a_ops = &sysv_aops;
- } else
- init_special_inode(inode, inode->i_mode, rdev);
-}
-
-struct inode *sysv_iget(struct super_block *sb, unsigned int ino)
-{
- struct sysv_sb_info * sbi = SYSV_SB(sb);
- struct buffer_head * bh;
- struct sysv_inode * raw_inode;
- struct sysv_inode_info * si;
- struct inode *inode;
- unsigned int block;
-
- if (!ino || ino > sbi->s_ninodes) {
- printk("Bad inode number on dev %s: %d is out of range\n",
- sb->s_id, ino);
- return ERR_PTR(-EIO);
- }
-
- inode = iget_locked(sb, ino);
- if (!inode)
- return ERR_PTR(-ENOMEM);
- if (!(inode->i_state & I_NEW))
- return inode;
-
- raw_inode = sysv_raw_inode(sb, ino, &bh);
- if (!raw_inode) {
- printk("Major problem: unable to read inode from dev %s\n",
- inode->i_sb->s_id);
- goto bad_inode;
- }
- /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
- inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode);
- i_uid_write(inode, (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid));
- i_gid_write(inode, (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid));
- set_nlink(inode, fs16_to_cpu(sbi, raw_inode->i_nlink));
- inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size);
- inode_set_atime(inode, fs32_to_cpu(sbi, raw_inode->i_atime), 0);
- inode_set_mtime(inode, fs32_to_cpu(sbi, raw_inode->i_mtime), 0);
- inode_set_ctime(inode, fs32_to_cpu(sbi, raw_inode->i_ctime), 0);
- inode->i_blocks = 0;
-
- si = SYSV_I(inode);
- for (block = 0; block < 10+1+1+1; block++)
- read3byte(sbi, &raw_inode->i_data[3*block],
- (u8 *)&si->i_data[block]);
- brelse(bh);
- si->i_dir_start_lookup = 0;
- if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
- sysv_set_inode(inode,
- old_decode_dev(fs32_to_cpu(sbi, si->i_data[0])));
- else
- sysv_set_inode(inode, 0);
- unlock_new_inode(inode);
- return inode;
-
-bad_inode:
- iget_failed(inode);
- return ERR_PTR(-EIO);
-}
-
-static int __sysv_write_inode(struct inode *inode, int wait)
-{
- struct super_block * sb = inode->i_sb;
- struct sysv_sb_info * sbi = SYSV_SB(sb);
- struct buffer_head * bh;
- struct sysv_inode * raw_inode;
- struct sysv_inode_info * si;
- unsigned int ino, block;
- int err = 0;
-
- ino = inode->i_ino;
- if (!ino || ino > sbi->s_ninodes) {
- printk("Bad inode number on dev %s: %d is out of range\n",
- inode->i_sb->s_id, ino);
- return -EIO;
- }
- raw_inode = sysv_raw_inode(sb, ino, &bh);
- if (!raw_inode) {
- printk("unable to read i-node block\n");
- return -EIO;
- }
-
- raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode);
- raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(i_uid_read(inode)));
- raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(i_gid_read(inode)));
- raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink);
- raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size);
- raw_inode->i_atime = cpu_to_fs32(sbi, inode_get_atime_sec(inode));
- raw_inode->i_mtime = cpu_to_fs32(sbi, inode_get_mtime_sec(inode));
- raw_inode->i_ctime = cpu_to_fs32(sbi, inode_get_ctime_sec(inode));
-
- si = SYSV_I(inode);
- if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
- si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev));
- for (block = 0; block < 10+1+1+1; block++)
- write3byte(sbi, (u8 *)&si->i_data[block],
- &raw_inode->i_data[3*block]);
- mark_buffer_dirty(bh);
- if (wait) {
- sync_dirty_buffer(bh);
- if (buffer_req(bh) && !buffer_uptodate(bh)) {
- printk ("IO error syncing sysv inode [%s:%08x]\n",
- sb->s_id, ino);
- err = -EIO;
- }
- }
- brelse(bh);
- return err;
-}
-
-int sysv_write_inode(struct inode *inode, struct writeback_control *wbc)
-{
- return __sysv_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
-}
-
-int sysv_sync_inode(struct inode *inode)
-{
- return __sysv_write_inode(inode, 1);
-}
-
-static void sysv_evict_inode(struct inode *inode)
-{
- truncate_inode_pages_final(&inode->i_data);
- if (!inode->i_nlink) {
- inode->i_size = 0;
- sysv_truncate(inode);
- }
- invalidate_inode_buffers(inode);
- clear_inode(inode);
- if (!inode->i_nlink)
- sysv_free_inode(inode);
-}
-
-static struct kmem_cache *sysv_inode_cachep;
-
-static struct inode *sysv_alloc_inode(struct super_block *sb)
-{
- struct sysv_inode_info *si;
-
- si = alloc_inode_sb(sb, sysv_inode_cachep, GFP_KERNEL);
- if (!si)
- return NULL;
- return &si->vfs_inode;
-}
-
-static void sysv_free_in_core_inode(struct inode *inode)
-{
- kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
-}
-
-static void init_once(void *p)
-{
- struct sysv_inode_info *si = (struct sysv_inode_info *)p;
-
- inode_init_once(&si->vfs_inode);
-}
-
-const struct super_operations sysv_sops = {
- .alloc_inode = sysv_alloc_inode,
- .free_inode = sysv_free_in_core_inode,
- .write_inode = sysv_write_inode,
- .evict_inode = sysv_evict_inode,
- .put_super = sysv_put_super,
- .sync_fs = sysv_sync_fs,
- .remount_fs = sysv_remount,
- .statfs = sysv_statfs,
-};
-
-int __init sysv_init_icache(void)
-{
- sysv_inode_cachep = kmem_cache_create("sysv_inode_cache",
- sizeof(struct sysv_inode_info), 0,
- SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
- init_once);
- if (!sysv_inode_cachep)
- return -ENOMEM;
- return 0;
-}
-
-void sysv_destroy_icache(void)
-{
- /*
- * Make sure all delayed rcu free inodes are flushed before we
- * destroy cache.
- */
- rcu_barrier();
- kmem_cache_destroy(sysv_inode_cachep);
-}
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/fs/sysv/itree.c
- *
- * Handling of indirect blocks' trees.
- * AV, Sep--Dec 2000
- */
-
-#include <linux/buffer_head.h>
-#include <linux/mount.h>
-#include <linux/mpage.h>
-#include <linux/string.h>
-#include "sysv.h"
-
-enum {DIRECT = 10, DEPTH = 4}; /* Have triple indirect */
-
-static inline void dirty_indirect(struct buffer_head *bh, struct inode *inode)
-{
- mark_buffer_dirty_inode(bh, inode);
- if (IS_SYNC(inode))
- sync_dirty_buffer(bh);
-}
-
-static int block_to_path(struct inode *inode, long block, int offsets[DEPTH])
-{
- struct super_block *sb = inode->i_sb;
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- int ptrs_bits = sbi->s_ind_per_block_bits;
- unsigned long indirect_blocks = sbi->s_ind_per_block,
- double_blocks = sbi->s_ind_per_block_2;
- int n = 0;
-
- if (block < 0) {
- printk("sysv_block_map: block < 0\n");
- } else if (block < DIRECT) {
- offsets[n++] = block;
- } else if ( (block -= DIRECT) < indirect_blocks) {
- offsets[n++] = DIRECT;
- offsets[n++] = block;
- } else if ((block -= indirect_blocks) < double_blocks) {
- offsets[n++] = DIRECT+1;
- offsets[n++] = block >> ptrs_bits;
- offsets[n++] = block & (indirect_blocks - 1);
- } else if (((block -= double_blocks) >> (ptrs_bits * 2)) < indirect_blocks) {
- offsets[n++] = DIRECT+2;
- offsets[n++] = block >> (ptrs_bits * 2);
- offsets[n++] = (block >> ptrs_bits) & (indirect_blocks - 1);
- offsets[n++] = block & (indirect_blocks - 1);
- } else {
- /* nothing */;
- }
- return n;
-}
-
-static inline int block_to_cpu(struct sysv_sb_info *sbi, sysv_zone_t nr)
-{
- return sbi->s_block_base + fs32_to_cpu(sbi, nr);
-}
-
-typedef struct {
- sysv_zone_t *p;
- sysv_zone_t key;
- struct buffer_head *bh;
-} Indirect;
-
-static DEFINE_RWLOCK(pointers_lock);
-
-static inline void add_chain(Indirect *p, struct buffer_head *bh, sysv_zone_t *v)
-{
- p->key = *(p->p = v);
- p->bh = bh;
-}
-
-static inline int verify_chain(Indirect *from, Indirect *to)
-{
- while (from <= to && from->key == *from->p)
- from++;
- return (from > to);
-}
-
-static inline sysv_zone_t *block_end(struct buffer_head *bh)
-{
- return (sysv_zone_t*)((char*)bh->b_data + bh->b_size);
-}
-
-static Indirect *get_branch(struct inode *inode,
- int depth,
- int offsets[],
- Indirect chain[],
- int *err)
-{
- struct super_block *sb = inode->i_sb;
- Indirect *p = chain;
- struct buffer_head *bh;
-
- *err = 0;
- add_chain(chain, NULL, SYSV_I(inode)->i_data + *offsets);
- if (!p->key)
- goto no_block;
- while (--depth) {
- int block = block_to_cpu(SYSV_SB(sb), p->key);
- bh = sb_bread(sb, block);
- if (!bh)
- goto failure;
- read_lock(&pointers_lock);
- if (!verify_chain(chain, p))
- goto changed;
- add_chain(++p, bh, (sysv_zone_t*)bh->b_data + *++offsets);
- read_unlock(&pointers_lock);
- if (!p->key)
- goto no_block;
- }
- return NULL;
-
-changed:
- read_unlock(&pointers_lock);
- brelse(bh);
- *err = -EAGAIN;
- goto no_block;
-failure:
- *err = -EIO;
-no_block:
- return p;
-}
-
-static int alloc_branch(struct inode *inode,
- int num,
- int *offsets,
- Indirect *branch)
-{
- int blocksize = inode->i_sb->s_blocksize;
- int n = 0;
- int i;
-
- branch[0].key = sysv_new_block(inode->i_sb);
- if (branch[0].key) for (n = 1; n < num; n++) {
- struct buffer_head *bh;
- int parent;
- /* Allocate the next block */
- branch[n].key = sysv_new_block(inode->i_sb);
- if (!branch[n].key)
- break;
- /*
- * Get buffer_head for parent block, zero it out and set
- * the pointer to new one, then send parent to disk.
- */
- parent = block_to_cpu(SYSV_SB(inode->i_sb), branch[n-1].key);
- bh = sb_getblk(inode->i_sb, parent);
- if (!bh) {
- sysv_free_block(inode->i_sb, branch[n].key);
- break;
- }
- lock_buffer(bh);
- memset(bh->b_data, 0, blocksize);
- branch[n].bh = bh;
- branch[n].p = (sysv_zone_t*) bh->b_data + offsets[n];
- *branch[n].p = branch[n].key;
- set_buffer_uptodate(bh);
- unlock_buffer(bh);
- dirty_indirect(bh, inode);
- }
- if (n == num)
- return 0;
-
- /* Allocation failed, free what we already allocated */
- for (i = 1; i < n; i++)
- bforget(branch[i].bh);
- for (i = 0; i < n; i++)
- sysv_free_block(inode->i_sb, branch[i].key);
- return -ENOSPC;
-}
-
-static inline int splice_branch(struct inode *inode,
- Indirect chain[],
- Indirect *where,
- int num)
-{
- int i;
-
- /* Verify that place we are splicing to is still there and vacant */
- write_lock(&pointers_lock);
- if (!verify_chain(chain, where-1) || *where->p)
- goto changed;
- *where->p = where->key;
- write_unlock(&pointers_lock);
-
- inode_set_ctime_current(inode);
-
- /* had we spliced it onto indirect block? */
- if (where->bh)
- dirty_indirect(where->bh, inode);
-
- if (IS_SYNC(inode))
- sysv_sync_inode(inode);
- else
- mark_inode_dirty(inode);
- return 0;
-
-changed:
- write_unlock(&pointers_lock);
- for (i = 1; i < num; i++)
- bforget(where[i].bh);
- for (i = 0; i < num; i++)
- sysv_free_block(inode->i_sb, where[i].key);
- return -EAGAIN;
-}
-
-static int get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
-{
- int err = -EIO;
- int offsets[DEPTH];
- Indirect chain[DEPTH];
- struct super_block *sb = inode->i_sb;
- Indirect *partial;
- int left;
- int depth = block_to_path(inode, iblock, offsets);
-
- if (depth == 0)
- goto out;
-
-reread:
- partial = get_branch(inode, depth, offsets, chain, &err);
-
- /* Simplest case - block found, no allocation needed */
- if (!partial) {
-got_it:
- map_bh(bh_result, sb, block_to_cpu(SYSV_SB(sb),
- chain[depth-1].key));
- /* Clean up and exit */
- partial = chain+depth-1; /* the whole chain */
- goto cleanup;
- }
-
- /* Next simple case - plain lookup or failed read of indirect block */
- if (!create || err == -EIO) {
-cleanup:
- while (partial > chain) {
- brelse(partial->bh);
- partial--;
- }
-out:
- return err;
- }
-
- /*
- * Indirect block might be removed by truncate while we were
- * reading it. Handling of that case (forget what we've got and
- * reread) is taken out of the main path.
- */
- if (err == -EAGAIN)
- goto changed;
-
- left = (chain + depth) - partial;
- err = alloc_branch(inode, left, offsets+(partial-chain), partial);
- if (err)
- goto cleanup;
-
- if (splice_branch(inode, chain, partial, left) < 0)
- goto changed;
-
- set_buffer_new(bh_result);
- goto got_it;
-
-changed:
- while (partial > chain) {
- brelse(partial->bh);
- partial--;
- }
- goto reread;
-}
-
-static inline int all_zeroes(sysv_zone_t *p, sysv_zone_t *q)
-{
- while (p < q)
- if (*p++)
- return 0;
- return 1;
-}
-
-static Indirect *find_shared(struct inode *inode,
- int depth,
- int offsets[],
- Indirect chain[],
- sysv_zone_t *top)
-{
- Indirect *partial, *p;
- int k, err;
-
- *top = 0;
- for (k = depth; k > 1 && !offsets[k-1]; k--)
- ;
- partial = get_branch(inode, k, offsets, chain, &err);
-
- write_lock(&pointers_lock);
- if (!partial)
- partial = chain + k-1;
- /*
- * If the branch acquired continuation since we've looked at it -
- * fine, it should all survive and (new) top doesn't belong to us.
- */
- if (!partial->key && *partial->p) {
- write_unlock(&pointers_lock);
- goto no_top;
- }
- for (p=partial; p>chain && all_zeroes((sysv_zone_t*)p->bh->b_data,p->p); p--)
- ;
- /*
- * OK, we've found the last block that must survive. The rest of our
- * branch should be detached before unlocking. However, if that rest
- * of branch is all ours and does not grow immediately from the inode
- * it's easier to cheat and just decrement partial->p.
- */
- if (p == chain + k - 1 && p > chain) {
- p->p--;
- } else {
- *top = *p->p;
- *p->p = 0;
- }
- write_unlock(&pointers_lock);
-
- while (partial > p) {
- brelse(partial->bh);
- partial--;
- }
-no_top:
- return partial;
-}
-
-static inline void free_data(struct inode *inode, sysv_zone_t *p, sysv_zone_t *q)
-{
- for ( ; p < q ; p++) {
- sysv_zone_t nr = *p;
- if (nr) {
- *p = 0;
- sysv_free_block(inode->i_sb, nr);
- mark_inode_dirty(inode);
- }
- }
-}
-
-static void free_branches(struct inode *inode, sysv_zone_t *p, sysv_zone_t *q, int depth)
-{
- struct buffer_head * bh;
- struct super_block *sb = inode->i_sb;
-
- if (depth--) {
- for ( ; p < q ; p++) {
- int block;
- sysv_zone_t nr = *p;
- if (!nr)
- continue;
- *p = 0;
- block = block_to_cpu(SYSV_SB(sb), nr);
- bh = sb_bread(sb, block);
- if (!bh)
- continue;
- free_branches(inode, (sysv_zone_t*)bh->b_data,
- block_end(bh), depth);
- bforget(bh);
- sysv_free_block(sb, nr);
- mark_inode_dirty(inode);
- }
- } else
- free_data(inode, p, q);
-}
-
-void sysv_truncate (struct inode * inode)
-{
- sysv_zone_t *i_data = SYSV_I(inode)->i_data;
- int offsets[DEPTH];
- Indirect chain[DEPTH];
- Indirect *partial;
- sysv_zone_t nr = 0;
- int n;
- long iblock;
- unsigned blocksize;
-
- if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
- S_ISLNK(inode->i_mode)))
- return;
-
- blocksize = inode->i_sb->s_blocksize;
- iblock = (inode->i_size + blocksize-1)
- >> inode->i_sb->s_blocksize_bits;
-
- block_truncate_page(inode->i_mapping, inode->i_size, get_block);
-
- n = block_to_path(inode, iblock, offsets);
- if (n == 0)
- return;
-
- if (n == 1) {
- free_data(inode, i_data+offsets[0], i_data + DIRECT);
- goto do_indirects;
- }
-
- partial = find_shared(inode, n, offsets, chain, &nr);
- /* Kill the top of shared branch (already detached) */
- if (nr) {
- if (partial == chain)
- mark_inode_dirty(inode);
- else
- dirty_indirect(partial->bh, inode);
- free_branches(inode, &nr, &nr+1, (chain+n-1) - partial);
- }
- /* Clear the ends of indirect blocks on the shared branch */
- while (partial > chain) {
- free_branches(inode, partial->p + 1, block_end(partial->bh),
- (chain+n-1) - partial);
- dirty_indirect(partial->bh, inode);
- brelse (partial->bh);
- partial--;
- }
-do_indirects:
- /* Kill the remaining (whole) subtrees (== subtrees deeper than...) */
- while (n < DEPTH) {
- nr = i_data[DIRECT + n - 1];
- if (nr) {
- i_data[DIRECT + n - 1] = 0;
- mark_inode_dirty(inode);
- free_branches(inode, &nr, &nr+1, n);
- }
- n++;
- }
- inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
- if (IS_SYNC(inode))
- sysv_sync_inode (inode);
- else
- mark_inode_dirty(inode);
-}
-
-static unsigned sysv_nblocks(struct super_block *s, loff_t size)
-{
- struct sysv_sb_info *sbi = SYSV_SB(s);
- int ptrs_bits = sbi->s_ind_per_block_bits;
- unsigned blocks, res, direct = DIRECT, i = DEPTH;
- blocks = (size + s->s_blocksize - 1) >> s->s_blocksize_bits;
- res = blocks;
- while (--i && blocks > direct) {
- blocks = ((blocks - direct - 1) >> ptrs_bits) + 1;
- res += blocks;
- direct = 1;
- }
- return res;
-}
-
-int sysv_getattr(struct mnt_idmap *idmap, const struct path *path,
- struct kstat *stat, u32 request_mask, unsigned int flags)
-{
- struct super_block *s = path->dentry->d_sb;
- generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(path->dentry),
- stat);
- stat->blocks = (s->s_blocksize / 512) * sysv_nblocks(s, stat->size);
- stat->blksize = s->s_blocksize;
- return 0;
-}
-
-static int sysv_writepages(struct address_space *mapping,
- struct writeback_control *wbc)
-{
- return mpage_writepages(mapping, wbc, get_block);
-}
-
-static int sysv_read_folio(struct file *file, struct folio *folio)
-{
- return block_read_full_folio(folio, get_block);
-}
-
-int sysv_prepare_chunk(struct folio *folio, loff_t pos, unsigned len)
-{
- return __block_write_begin(folio, pos, len, get_block);
-}
-
-static void sysv_write_failed(struct address_space *mapping, loff_t to)
-{
- struct inode *inode = mapping->host;
-
- if (to > inode->i_size) {
- truncate_pagecache(inode, inode->i_size);
- sysv_truncate(inode);
- }
-}
-
-static int sysv_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len,
- struct folio **foliop, void **fsdata)
-{
- int ret;
-
- ret = block_write_begin(mapping, pos, len, foliop, get_block);
- if (unlikely(ret))
- sysv_write_failed(mapping, pos + len);
-
- return ret;
-}
-
-static sector_t sysv_bmap(struct address_space *mapping, sector_t block)
-{
- return generic_block_bmap(mapping,block,get_block);
-}
-
-const struct address_space_operations sysv_aops = {
- .dirty_folio = block_dirty_folio,
- .invalidate_folio = block_invalidate_folio,
- .read_folio = sysv_read_folio,
- .writepages = sysv_writepages,
- .write_begin = sysv_write_begin,
- .write_end = generic_write_end,
- .migrate_folio = buffer_migrate_folio,
- .bmap = sysv_bmap
-};
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/fs/sysv/namei.c
- *
- * minix/namei.c
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * coh/namei.c
- * Copyright (C) 1993 Pascal Haible, Bruno Haible
- *
- * sysv/namei.c
- * Copyright (C) 1993 Bruno Haible
- * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
- */
-
-#include <linux/pagemap.h>
-#include "sysv.h"
-
-static int add_nondir(struct dentry *dentry, struct inode *inode)
-{
- int err = sysv_add_link(dentry, inode);
- if (!err) {
- d_instantiate(dentry, inode);
- return 0;
- }
- inode_dec_link_count(inode);
- iput(inode);
- return err;
-}
-
-static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags)
-{
- struct inode * inode = NULL;
- ino_t ino;
-
- if (dentry->d_name.len > SYSV_NAMELEN)
- return ERR_PTR(-ENAMETOOLONG);
- ino = sysv_inode_by_name(dentry);
- if (ino)
- inode = sysv_iget(dir->i_sb, ino);
- return d_splice_alias(inode, dentry);
-}
-
-static int sysv_mknod(struct mnt_idmap *idmap, struct inode *dir,
- struct dentry *dentry, umode_t mode, dev_t rdev)
-{
- struct inode * inode;
- int err;
-
- if (!old_valid_dev(rdev))
- return -EINVAL;
-
- inode = sysv_new_inode(dir, mode);
- err = PTR_ERR(inode);
-
- if (!IS_ERR(inode)) {
- sysv_set_inode(inode, rdev);
- mark_inode_dirty(inode);
- err = add_nondir(dentry, inode);
- }
- return err;
-}
-
-static int sysv_create(struct mnt_idmap *idmap, struct inode *dir,
- struct dentry *dentry, umode_t mode, bool excl)
-{
- return sysv_mknod(&nop_mnt_idmap, dir, dentry, mode, 0);
-}
-
-static int sysv_symlink(struct mnt_idmap *idmap, struct inode *dir,
- struct dentry *dentry, const char *symname)
-{
- int err = -ENAMETOOLONG;
- int l = strlen(symname)+1;
- struct inode * inode;
-
- if (l > dir->i_sb->s_blocksize)
- goto out;
-
- inode = sysv_new_inode(dir, S_IFLNK|0777);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out;
-
- sysv_set_inode(inode, 0);
- err = page_symlink(inode, symname, l);
- if (err)
- goto out_fail;
-
- mark_inode_dirty(inode);
- err = add_nondir(dentry, inode);
-out:
- return err;
-
-out_fail:
- inode_dec_link_count(inode);
- iput(inode);
- goto out;
-}
-
-static int sysv_link(struct dentry * old_dentry, struct inode * dir,
- struct dentry * dentry)
-{
- struct inode *inode = d_inode(old_dentry);
-
- inode_set_ctime_current(inode);
- inode_inc_link_count(inode);
- ihold(inode);
-
- return add_nondir(dentry, inode);
-}
-
-static int sysv_mkdir(struct mnt_idmap *idmap, struct inode *dir,
- struct dentry *dentry, umode_t mode)
-{
- struct inode * inode;
- int err;
-
- inode_inc_link_count(dir);
-
- inode = sysv_new_inode(dir, S_IFDIR|mode);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out_dir;
-
- sysv_set_inode(inode, 0);
-
- inode_inc_link_count(inode);
-
- err = sysv_make_empty(inode, dir);
- if (err)
- goto out_fail;
-
- err = sysv_add_link(dentry, inode);
- if (err)
- goto out_fail;
-
- d_instantiate(dentry, inode);
-out:
- return err;
-
-out_fail:
- inode_dec_link_count(inode);
- inode_dec_link_count(inode);
- iput(inode);
-out_dir:
- inode_dec_link_count(dir);
- goto out;
-}
-
-static int sysv_unlink(struct inode * dir, struct dentry * dentry)
-{
- struct inode * inode = d_inode(dentry);
- struct folio *folio;
- struct sysv_dir_entry * de;
- int err;
-
- de = sysv_find_entry(dentry, &folio);
- if (!de)
- return -ENOENT;
-
- err = sysv_delete_entry(de, folio);
- if (!err) {
- inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
- inode_dec_link_count(inode);
- }
- folio_release_kmap(folio, de);
- return err;
-}
-
-static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
-{
- struct inode *inode = d_inode(dentry);
- int err = -ENOTEMPTY;
-
- if (sysv_empty_dir(inode)) {
- err = sysv_unlink(dir, dentry);
- if (!err) {
- inode->i_size = 0;
- inode_dec_link_count(inode);
- inode_dec_link_count(dir);
- }
- }
- return err;
-}
-
-/*
- * Anybody can rename anything with this: the permission checks are left to the
- * higher-level routines.
- */
-static int sysv_rename(struct mnt_idmap *idmap, struct inode *old_dir,
- struct dentry *old_dentry, struct inode *new_dir,
- struct dentry *new_dentry, unsigned int flags)
-{
- struct inode * old_inode = d_inode(old_dentry);
- struct inode * new_inode = d_inode(new_dentry);
- struct folio *dir_folio;
- struct sysv_dir_entry * dir_de = NULL;
- struct folio *old_folio;
- struct sysv_dir_entry * old_de;
- int err = -ENOENT;
-
- if (flags & ~RENAME_NOREPLACE)
- return -EINVAL;
-
- old_de = sysv_find_entry(old_dentry, &old_folio);
- if (!old_de)
- goto out;
-
- if (S_ISDIR(old_inode->i_mode)) {
- err = -EIO;
- dir_de = sysv_dotdot(old_inode, &dir_folio);
- if (!dir_de)
- goto out_old;
- }
-
- if (new_inode) {
- struct folio *new_folio;
- struct sysv_dir_entry * new_de;
-
- err = -ENOTEMPTY;
- if (dir_de && !sysv_empty_dir(new_inode))
- goto out_dir;
-
- err = -ENOENT;
- new_de = sysv_find_entry(new_dentry, &new_folio);
- if (!new_de)
- goto out_dir;
- err = sysv_set_link(new_de, new_folio, old_inode);
- folio_release_kmap(new_folio, new_de);
- if (err)
- goto out_dir;
- inode_set_ctime_current(new_inode);
- if (dir_de)
- drop_nlink(new_inode);
- inode_dec_link_count(new_inode);
- } else {
- err = sysv_add_link(new_dentry, old_inode);
- if (err)
- goto out_dir;
- if (dir_de)
- inode_inc_link_count(new_dir);
- }
-
- err = sysv_delete_entry(old_de, old_folio);
- if (err)
- goto out_dir;
-
- mark_inode_dirty(old_inode);
-
- if (dir_de) {
- err = sysv_set_link(dir_de, dir_folio, new_dir);
- if (!err)
- inode_dec_link_count(old_dir);
- }
-
-out_dir:
- if (dir_de)
- folio_release_kmap(dir_folio, dir_de);
-out_old:
- folio_release_kmap(old_folio, old_de);
-out:
- return err;
-}
-
-/*
- * directories can handle most operations...
- */
-const struct inode_operations sysv_dir_inode_operations = {
- .create = sysv_create,
- .lookup = sysv_lookup,
- .link = sysv_link,
- .unlink = sysv_unlink,
- .symlink = sysv_symlink,
- .mkdir = sysv_mkdir,
- .rmdir = sysv_rmdir,
- .mknod = sysv_mknod,
- .rename = sysv_rename,
- .getattr = sysv_getattr,
-};
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * linux/fs/sysv/inode.c
- *
- * minix/inode.c
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * xenix/inode.c
- * Copyright (C) 1992 Doug Evans
- *
- * coh/inode.c
- * Copyright (C) 1993 Pascal Haible, Bruno Haible
- *
- * sysv/inode.c
- * Copyright (C) 1993 Paul B. Monday
- *
- * sysv/inode.c
- * Copyright (C) 1993 Bruno Haible
- * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
- *
- * This file contains code for read/parsing the superblock.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/buffer_head.h>
-#include <linux/fs_context.h>
-#include "sysv.h"
-
-/*
- * The following functions try to recognize specific filesystems.
- *
- * We recognize:
- * - Xenix FS by its magic number.
- * - SystemV FS by its magic number.
- * - Coherent FS by its funny fname/fpack field.
- * - SCO AFS by s_nfree == 0xffff
- * - V7 FS has no distinguishing features.
- *
- * We discriminate among SystemV4 and SystemV2 FS by the assumption that
- * the time stamp is not < 01-01-1980.
- */
-
-enum {
- JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60
-};
-
-static void detected_xenix(struct sysv_sb_info *sbi, unsigned *max_links)
-{
- struct buffer_head *bh1 = sbi->s_bh1;
- struct buffer_head *bh2 = sbi->s_bh2;
- struct xenix_super_block * sbd1;
- struct xenix_super_block * sbd2;
-
- if (bh1 != bh2)
- sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
- else {
- /* block size = 512, so bh1 != bh2 */
- sbd1 = (struct xenix_super_block *) bh1->b_data;
- sbd2 = (struct xenix_super_block *) (bh2->b_data - 512);
- }
-
- *max_links = XENIX_LINK_MAX;
- sbi->s_fic_size = XENIX_NICINOD;
- sbi->s_flc_size = XENIX_NICFREE;
- sbi->s_sbd1 = (char *)sbd1;
- sbi->s_sbd2 = (char *)sbd2;
- sbi->s_sb_fic_count = &sbd1->s_ninode;
- sbi->s_sb_fic_inodes = &sbd1->s_inode[0];
- sbi->s_sb_total_free_inodes = &sbd2->s_tinode;
- sbi->s_bcache_count = &sbd1->s_nfree;
- sbi->s_bcache = &sbd1->s_free[0];
- sbi->s_free_blocks = &sbd2->s_tfree;
- sbi->s_sb_time = &sbd2->s_time;
- sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize);
- sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize);
-}
-
-static void detected_sysv4(struct sysv_sb_info *sbi, unsigned *max_links)
-{
- struct sysv4_super_block * sbd;
- struct buffer_head *bh1 = sbi->s_bh1;
- struct buffer_head *bh2 = sbi->s_bh2;
-
- if (bh1 == bh2)
- sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2);
- else
- sbd = (struct sysv4_super_block *) bh2->b_data;
-
- *max_links = SYSV_LINK_MAX;
- sbi->s_fic_size = SYSV_NICINOD;
- sbi->s_flc_size = SYSV_NICFREE;
- sbi->s_sbd1 = (char *)sbd;
- sbi->s_sbd2 = (char *)sbd;
- sbi->s_sb_fic_count = &sbd->s_ninode;
- sbi->s_sb_fic_inodes = &sbd->s_inode[0];
- sbi->s_sb_total_free_inodes = &sbd->s_tinode;
- sbi->s_bcache_count = &sbd->s_nfree;
- sbi->s_bcache = &sbd->s_free[0];
- sbi->s_free_blocks = &sbd->s_tfree;
- sbi->s_sb_time = &sbd->s_time;
- sbi->s_sb_state = &sbd->s_state;
- sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
- sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
-}
-
-static void detected_sysv2(struct sysv_sb_info *sbi, unsigned *max_links)
-{
- struct sysv2_super_block *sbd;
- struct buffer_head *bh1 = sbi->s_bh1;
- struct buffer_head *bh2 = sbi->s_bh2;
-
- if (bh1 == bh2)
- sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2);
- else
- sbd = (struct sysv2_super_block *) bh2->b_data;
-
- *max_links = SYSV_LINK_MAX;
- sbi->s_fic_size = SYSV_NICINOD;
- sbi->s_flc_size = SYSV_NICFREE;
- sbi->s_sbd1 = (char *)sbd;
- sbi->s_sbd2 = (char *)sbd;
- sbi->s_sb_fic_count = &sbd->s_ninode;
- sbi->s_sb_fic_inodes = &sbd->s_inode[0];
- sbi->s_sb_total_free_inodes = &sbd->s_tinode;
- sbi->s_bcache_count = &sbd->s_nfree;
- sbi->s_bcache = &sbd->s_free[0];
- sbi->s_free_blocks = &sbd->s_tfree;
- sbi->s_sb_time = &sbd->s_time;
- sbi->s_sb_state = &sbd->s_state;
- sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
- sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
-}
-
-static void detected_coherent(struct sysv_sb_info *sbi, unsigned *max_links)
-{
- struct coh_super_block * sbd;
- struct buffer_head *bh1 = sbi->s_bh1;
-
- sbd = (struct coh_super_block *) bh1->b_data;
-
- *max_links = COH_LINK_MAX;
- sbi->s_fic_size = COH_NICINOD;
- sbi->s_flc_size = COH_NICFREE;
- sbi->s_sbd1 = (char *)sbd;
- sbi->s_sbd2 = (char *)sbd;
- sbi->s_sb_fic_count = &sbd->s_ninode;
- sbi->s_sb_fic_inodes = &sbd->s_inode[0];
- sbi->s_sb_total_free_inodes = &sbd->s_tinode;
- sbi->s_bcache_count = &sbd->s_nfree;
- sbi->s_bcache = &sbd->s_free[0];
- sbi->s_free_blocks = &sbd->s_tfree;
- sbi->s_sb_time = &sbd->s_time;
- sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
- sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
-}
-
-static void detected_v7(struct sysv_sb_info *sbi, unsigned *max_links)
-{
- struct buffer_head *bh2 = sbi->s_bh2;
- struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data;
-
- *max_links = V7_LINK_MAX;
- sbi->s_fic_size = V7_NICINOD;
- sbi->s_flc_size = V7_NICFREE;
- sbi->s_sbd1 = (char *)sbd;
- sbi->s_sbd2 = (char *)sbd;
- sbi->s_sb_fic_count = &sbd->s_ninode;
- sbi->s_sb_fic_inodes = &sbd->s_inode[0];
- sbi->s_sb_total_free_inodes = &sbd->s_tinode;
- sbi->s_bcache_count = &sbd->s_nfree;
- sbi->s_bcache = &sbd->s_free[0];
- sbi->s_free_blocks = &sbd->s_tfree;
- sbi->s_sb_time = &sbd->s_time;
- sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize);
- sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
-}
-
-static int detect_xenix(struct sysv_sb_info *sbi, struct buffer_head *bh)
-{
- struct xenix_super_block *sbd = (struct xenix_super_block *)bh->b_data;
- if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0x2b5544))
- sbi->s_bytesex = BYTESEX_LE;
- else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0x2b5544))
- sbi->s_bytesex = BYTESEX_BE;
- else
- return 0;
- switch (fs32_to_cpu(sbi, sbd->s_type)) {
- case 1:
- sbi->s_type = FSTYPE_XENIX;
- return 1;
- case 2:
- sbi->s_type = FSTYPE_XENIX;
- return 2;
- default:
- return 0;
- }
-}
-
-static int detect_sysv(struct sysv_sb_info *sbi, struct buffer_head *bh)
-{
- struct super_block *sb = sbi->s_sb;
- /* All relevant fields are at the same offsets in R2 and R4 */
- struct sysv4_super_block * sbd;
- u32 type;
-
- sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
- if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0xfd187e20))
- sbi->s_bytesex = BYTESEX_LE;
- else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0xfd187e20))
- sbi->s_bytesex = BYTESEX_BE;
- else
- return 0;
-
- type = fs32_to_cpu(sbi, sbd->s_type);
-
- if (fs16_to_cpu(sbi, sbd->s_nfree) == 0xffff) {
- sbi->s_type = FSTYPE_AFS;
- sbi->s_forced_ro = 1;
- if (!sb_rdonly(sb)) {
- printk("SysV FS: SCO EAFS on %s detected, "
- "forcing read-only mode.\n",
- sb->s_id);
- }
- return type;
- }
-
- if (fs32_to_cpu(sbi, sbd->s_time) < JAN_1_1980) {
- /* this is likely to happen on SystemV2 FS */
- if (type > 3 || type < 1)
- return 0;
- sbi->s_type = FSTYPE_SYSV2;
- return type;
- }
- if ((type > 3 || type < 1) && (type > 0x30 || type < 0x10))
- return 0;
-
- /* On Interactive Unix (ISC) Version 4.0/3.x s_type field = 0x10,
- 0x20 or 0x30 indicates that symbolic links and the 14-character
- filename limit is gone. Due to lack of information about this
- feature read-only mode seems to be a reasonable approach... -KGB */
-
- if (type >= 0x10) {
- printk("SysV FS: can't handle long file names on %s, "
- "forcing read-only mode.\n", sb->s_id);
- sbi->s_forced_ro = 1;
- }
-
- sbi->s_type = FSTYPE_SYSV4;
- return type >= 0x10 ? type >> 4 : type;
-}
-
-static int detect_coherent(struct sysv_sb_info *sbi, struct buffer_head *bh)
-{
- struct coh_super_block * sbd;
-
- sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2);
- if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
- || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
- return 0;
- sbi->s_bytesex = BYTESEX_PDP;
- sbi->s_type = FSTYPE_COH;
- return 1;
-}
-
-static int detect_sysv_odd(struct sysv_sb_info *sbi, struct buffer_head *bh)
-{
- int size = detect_sysv(sbi, bh);
-
- return size>2 ? 0 : size;
-}
-
-static struct {
- int block;
- int (*test)(struct sysv_sb_info *, struct buffer_head *);
-} flavours[] = {
- {1, detect_xenix},
- {0, detect_sysv},
- {0, detect_coherent},
- {9, detect_sysv_odd},
- {15,detect_sysv_odd},
- {18,detect_sysv},
-};
-
-static char *flavour_names[] = {
- [FSTYPE_XENIX] = "Xenix",
- [FSTYPE_SYSV4] = "SystemV",
- [FSTYPE_SYSV2] = "SystemV Release 2",
- [FSTYPE_COH] = "Coherent",
- [FSTYPE_V7] = "V7",
- [FSTYPE_AFS] = "AFS",
-};
-
-static void (*flavour_setup[])(struct sysv_sb_info *, unsigned *) = {
- [FSTYPE_XENIX] = detected_xenix,
- [FSTYPE_SYSV4] = detected_sysv4,
- [FSTYPE_SYSV2] = detected_sysv2,
- [FSTYPE_COH] = detected_coherent,
- [FSTYPE_V7] = detected_v7,
- [FSTYPE_AFS] = detected_sysv4,
-};
-
-static int complete_read_super(struct super_block *sb, int silent, int size)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
- struct inode *root_inode;
- char *found = flavour_names[sbi->s_type];
- u_char n_bits = size+8;
- int bsize = 1 << n_bits;
- int bsize_4 = bsize >> 2;
-
- sbi->s_firstinodezone = 2;
-
- flavour_setup[sbi->s_type](sbi, &sb->s_max_links);
- if (sbi->s_firstdatazone < sbi->s_firstinodezone)
- return 0;
-
- sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;
- sbi->s_inodes_per_block = bsize >> 6;
- sbi->s_inodes_per_block_1 = (bsize >> 6)-1;
- sbi->s_inodes_per_block_bits = n_bits-6;
- sbi->s_ind_per_block = bsize_4;
- sbi->s_ind_per_block_2 = bsize_4*bsize_4;
- sbi->s_toobig_block = 10 + bsize_4 * (1 + bsize_4 * (1 + bsize_4));
- sbi->s_ind_per_block_bits = n_bits-2;
-
- sbi->s_ninodes = (sbi->s_firstdatazone - sbi->s_firstinodezone)
- << sbi->s_inodes_per_block_bits;
-
- if (!silent)
- printk("VFS: Found a %s FS (block size = %ld) on device %s\n",
- found, sb->s_blocksize, sb->s_id);
-
- sb->s_magic = SYSV_MAGIC_BASE + sbi->s_type;
- /* set up enough so that it can read an inode */
- sb->s_op = &sysv_sops;
- if (sbi->s_forced_ro)
- sb->s_flags |= SB_RDONLY;
- root_inode = sysv_iget(sb, SYSV_ROOT_INO);
- if (IS_ERR(root_inode)) {
- printk("SysV FS: get root inode failed\n");
- return 0;
- }
- sb->s_root = d_make_root(root_inode);
- if (!sb->s_root) {
- printk("SysV FS: get root dentry failed\n");
- return 0;
- }
- return 1;
-}
-
-static int sysv_fill_super(struct super_block *sb, struct fs_context *fc)
-{
- struct buffer_head *bh1, *bh = NULL;
- struct sysv_sb_info *sbi;
- unsigned long blocknr;
- int size = 0, i;
- int silent = fc->sb_flags & SB_SILENT;
-
- BUILD_BUG_ON(1024 != sizeof (struct xenix_super_block));
- BUILD_BUG_ON(512 != sizeof (struct sysv4_super_block));
- BUILD_BUG_ON(512 != sizeof (struct sysv2_super_block));
- BUILD_BUG_ON(500 != sizeof (struct coh_super_block));
- BUILD_BUG_ON(64 != sizeof (struct sysv_inode));
-
- sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
- if (!sbi)
- return -ENOMEM;
-
- sbi->s_sb = sb;
- sbi->s_block_base = 0;
- mutex_init(&sbi->s_lock);
- sb->s_fs_info = sbi;
- sb->s_time_min = 0;
- sb->s_time_max = U32_MAX;
- sb_set_blocksize(sb, BLOCK_SIZE);
-
- for (i = 0; i < ARRAY_SIZE(flavours) && !size; i++) {
- brelse(bh);
- bh = sb_bread(sb, flavours[i].block);
- if (!bh)
- continue;
- size = flavours[i].test(SYSV_SB(sb), bh);
- }
-
- if (!size)
- goto Eunknown;
-
- switch (size) {
- case 1:
- blocknr = bh->b_blocknr << 1;
- brelse(bh);
- sb_set_blocksize(sb, 512);
- bh1 = sb_bread(sb, blocknr);
- bh = sb_bread(sb, blocknr + 1);
- break;
- case 2:
- bh1 = bh;
- break;
- case 3:
- blocknr = bh->b_blocknr >> 1;
- brelse(bh);
- sb_set_blocksize(sb, 2048);
- bh1 = bh = sb_bread(sb, blocknr);
- break;
- default:
- goto Ebadsize;
- }
-
- if (bh && bh1) {
- sbi->s_bh1 = bh1;
- sbi->s_bh2 = bh;
- if (complete_read_super(sb, silent, size))
- return 0;
- }
-
- brelse(bh1);
- brelse(bh);
- sb_set_blocksize(sb, BLOCK_SIZE);
- printk("oldfs: cannot read superblock\n");
-failed:
- kfree(sbi);
- return -EINVAL;
-
-Eunknown:
- brelse(bh);
- if (!silent)
- printk("VFS: unable to find oldfs superblock on device %s\n",
- sb->s_id);
- goto failed;
-Ebadsize:
- brelse(bh);
- if (!silent)
- printk("VFS: oldfs: unsupported block size (%dKb)\n",
- 1<<(size-2));
- goto failed;
-}
-
-static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh)
-{
- struct v7_super_block *v7sb;
- struct sysv_inode *v7i;
- struct buffer_head *bh2;
- struct sysv_sb_info *sbi;
-
- sbi = sb->s_fs_info;
-
- /* plausibility check on superblock */
- v7sb = (struct v7_super_block *) bh->b_data;
- if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE ||
- fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD ||
- fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE)
- return 0;
-
- /* plausibility check on root inode: it is a directory,
- with a nonzero size that is a multiple of 16 */
- bh2 = sb_bread(sb, 2);
- if (bh2 == NULL)
- return 0;
-
- v7i = (struct sysv_inode *)(bh2->b_data + 64);
- if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR ||
- (fs32_to_cpu(sbi, v7i->i_size) == 0) ||
- (fs32_to_cpu(sbi, v7i->i_size) & 017) ||
- (fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES *
- sizeof(struct sysv_dir_entry))) {
- brelse(bh2);
- return 0;
- }
-
- brelse(bh2);
- return 1;
-}
-
-static int v7_fill_super(struct super_block *sb, struct fs_context *fc)
-{
- struct sysv_sb_info *sbi;
- struct buffer_head *bh;
- int silent = fc->sb_flags & SB_SILENT;
-
- BUILD_BUG_ON(sizeof(struct v7_super_block) != 440);
- BUILD_BUG_ON(sizeof(struct sysv_inode) != 64);
-
- sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL);
- if (!sbi)
- return -ENOMEM;
-
- sbi->s_sb = sb;
- sbi->s_block_base = 0;
- sbi->s_type = FSTYPE_V7;
- mutex_init(&sbi->s_lock);
- sb->s_fs_info = sbi;
- sb->s_time_min = 0;
- sb->s_time_max = U32_MAX;
-
- sb_set_blocksize(sb, 512);
-
- if ((bh = sb_bread(sb, 1)) == NULL) {
- if (!silent)
- printk("VFS: unable to read V7 FS superblock on "
- "device %s.\n", sb->s_id);
- goto failed;
- }
-
- /* Try PDP-11 UNIX */
- sbi->s_bytesex = BYTESEX_PDP;
- if (v7_sanity_check(sb, bh))
- goto detected;
-
- /* Try PC/IX, v7/x86 */
- sbi->s_bytesex = BYTESEX_LE;
- if (v7_sanity_check(sb, bh))
- goto detected;
-
- goto failed;
-
-detected:
- sbi->s_bh1 = bh;
- sbi->s_bh2 = bh;
- if (complete_read_super(sb, silent, 1))
- return 0;
-
-failed:
- printk(KERN_ERR "VFS: could not find a valid V7 on %s.\n",
- sb->s_id);
- brelse(bh);
- kfree(sbi);
- return -EINVAL;
-}
-
-/* Every kernel module contains stuff like this. */
-
-static int sysv_get_tree(struct fs_context *fc)
-{
- return get_tree_bdev(fc, sysv_fill_super);
-}
-
-static int v7_get_tree(struct fs_context *fc)
-{
- return get_tree_bdev(fc, v7_fill_super);
-}
-
-static const struct fs_context_operations sysv_context_ops = {
- .get_tree = sysv_get_tree,
-};
-
-static const struct fs_context_operations v7_context_ops = {
- .get_tree = v7_get_tree,
-};
-
-static int sysv_init_fs_context(struct fs_context *fc)
-{
- fc->ops = &sysv_context_ops;
- return 0;
-}
-
-static int v7_init_fs_context(struct fs_context *fc)
-{
- fc->ops = &v7_context_ops;
- return 0;
-}
-
-static struct file_system_type sysv_fs_type = {
- .owner = THIS_MODULE,
- .name = "sysv",
- .kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
- .init_fs_context = sysv_init_fs_context,
-};
-MODULE_ALIAS_FS("sysv");
-
-static struct file_system_type v7_fs_type = {
- .owner = THIS_MODULE,
- .name = "v7",
- .kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
- .init_fs_context = v7_init_fs_context,
-};
-MODULE_ALIAS_FS("v7");
-MODULE_ALIAS("v7");
-
-static int __init init_sysv_fs(void)
-{
- int error;
-
- error = sysv_init_icache();
- if (error)
- goto out;
- error = register_filesystem(&sysv_fs_type);
- if (error)
- goto destroy_icache;
- error = register_filesystem(&v7_fs_type);
- if (error)
- goto unregister;
- return 0;
-
-unregister:
- unregister_filesystem(&sysv_fs_type);
-destroy_icache:
- sysv_destroy_icache();
-out:
- return error;
-}
-
-static void __exit exit_sysv_fs(void)
-{
- unregister_filesystem(&sysv_fs_type);
- unregister_filesystem(&v7_fs_type);
- sysv_destroy_icache();
-}
-
-module_init(init_sysv_fs)
-module_exit(exit_sysv_fs)
-MODULE_DESCRIPTION("SystemV Filesystem");
-MODULE_LICENSE("GPL");
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _SYSV_H
-#define _SYSV_H
-
-#include <linux/buffer_head.h>
-
-typedef __u16 __bitwise __fs16;
-typedef __u32 __bitwise __fs32;
-
-#include <linux/sysv_fs.h>
-
-/*
- * SystemV/V7/Coherent super-block data in memory
- *
- * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
- * while the system is running). This is in contrast to the Minix and Berkeley
- * filesystems (where the superblock is never modified). This affects the
- * sync() operation: we must keep the superblock in a disk buffer and use this
- * one as our "working copy".
- */
-
-struct sysv_sb_info {
- struct super_block *s_sb; /* VFS superblock */
- int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
- char s_bytesex; /* bytesex (le/be/pdp) */
- unsigned int s_inodes_per_block; /* number of inodes per block */
- unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
- unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
- unsigned int s_ind_per_block; /* number of indirections per block */
- unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */
- unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */
- unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */
- unsigned int s_block_base; /* physical block number of block 0 */
- unsigned short s_fic_size; /* free inode cache size, NICINOD */
- unsigned short s_flc_size; /* free block list chunk size, NICFREE */
- /* The superblock is kept in one or two disk buffers: */
- struct buffer_head *s_bh1;
- struct buffer_head *s_bh2;
- /* These are pointers into the disk buffer, to compensate for
- different superblock layout. */
- char * s_sbd1; /* entire superblock data, for part 1 */
- char * s_sbd2; /* entire superblock data, for part 2 */
- __fs16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
- sysv_ino_t *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
- __fs16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
- __fs16 *s_bcache_count; /* pointer to s_sbd->s_nfree */
- sysv_zone_t *s_bcache; /* pointer to s_sbd->s_free */
- __fs32 *s_free_blocks; /* pointer to s_sbd->s_tfree */
- __fs32 *s_sb_time; /* pointer to s_sbd->s_time */
- __fs32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
- /* We keep those superblock entities that don't change here;
- this saves us an indirection and perhaps a conversion. */
- u32 s_firstinodezone; /* index of first inode zone */
- u32 s_firstdatazone; /* same as s_sbd->s_isize */
- u32 s_ninodes; /* total number of inodes */
- u32 s_ndatazones; /* total number of data zones */
- u32 s_nzones; /* same as s_sbd->s_fsize */
- u16 s_namelen; /* max length of dir entry */
- int s_forced_ro;
- struct mutex s_lock;
-};
-
-/*
- * SystemV/V7/Coherent FS inode data in memory
- */
-struct sysv_inode_info {
- __fs32 i_data[13];
- u32 i_dir_start_lookup;
- struct inode vfs_inode;
-};
-
-
-static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
-{
- return container_of(inode, struct sysv_inode_info, vfs_inode);
-}
-
-static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
-{
- return sb->s_fs_info;
-}
-
-
-/* identify the FS in memory */
-enum {
- FSTYPE_NONE = 0,
- FSTYPE_XENIX,
- FSTYPE_SYSV4,
- FSTYPE_SYSV2,
- FSTYPE_COH,
- FSTYPE_V7,
- FSTYPE_AFS,
- FSTYPE_END,
-};
-
-#define SYSV_MAGIC_BASE 0x012FF7B3
-
-#define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX)
-#define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
-#define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
-#define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH)
-
-
-/* Admissible values for i_nlink: 0.._LINK_MAX */
-enum {
- XENIX_LINK_MAX = 126, /* ?? */
- SYSV_LINK_MAX = 126, /* 127? 251? */
- V7_LINK_MAX = 126, /* ?? */
- COH_LINK_MAX = 10000,
-};
-
-
-static inline void dirty_sb(struct super_block *sb)
-{
- struct sysv_sb_info *sbi = SYSV_SB(sb);
-
- mark_buffer_dirty(sbi->s_bh1);
- if (sbi->s_bh1 != sbi->s_bh2)
- mark_buffer_dirty(sbi->s_bh2);
-}
-
-
-/* ialloc.c */
-extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
- struct buffer_head **);
-extern struct inode * sysv_new_inode(const struct inode *, umode_t);
-extern void sysv_free_inode(struct inode *);
-extern unsigned long sysv_count_free_inodes(struct super_block *);
-
-/* balloc.c */
-extern sysv_zone_t sysv_new_block(struct super_block *);
-extern void sysv_free_block(struct super_block *, sysv_zone_t);
-extern unsigned long sysv_count_free_blocks(struct super_block *);
-
-/* itree.c */
-void sysv_truncate(struct inode *);
-int sysv_prepare_chunk(struct folio *folio, loff_t pos, unsigned len);
-
-/* inode.c */
-extern struct inode *sysv_iget(struct super_block *, unsigned int);
-extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
-extern int sysv_sync_inode(struct inode *);
-extern void sysv_set_inode(struct inode *, dev_t);
-extern int sysv_getattr(struct mnt_idmap *, const struct path *,
- struct kstat *, u32, unsigned int);
-extern int sysv_init_icache(void);
-extern void sysv_destroy_icache(void);
-
-
-/* dir.c */
-struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct folio **);
-int sysv_add_link(struct dentry *, struct inode *);
-int sysv_delete_entry(struct sysv_dir_entry *, struct folio *);
-int sysv_make_empty(struct inode *, struct inode *);
-int sysv_empty_dir(struct inode *);
-int sysv_set_link(struct sysv_dir_entry *, struct folio *,
- struct inode *);
-struct sysv_dir_entry *sysv_dotdot(struct inode *, struct folio **);
-ino_t sysv_inode_by_name(struct dentry *);
-
-
-extern const struct inode_operations sysv_file_inode_operations;
-extern const struct inode_operations sysv_dir_inode_operations;
-extern const struct file_operations sysv_file_operations;
-extern const struct file_operations sysv_dir_operations;
-extern const struct address_space_operations sysv_aops;
-extern const struct super_operations sysv_sops;
-
-
-enum {
- BYTESEX_LE,
- BYTESEX_PDP,
- BYTESEX_BE,
-};
-
-static inline u32 PDP_swab(u32 x)
-{
-#ifdef __LITTLE_ENDIAN
- return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
-#else
-#ifdef __BIG_ENDIAN
- return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
-#else
-#error BYTESEX
-#endif
-#endif
-}
-
-static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
-{
- if (sbi->s_bytesex == BYTESEX_PDP)
- return PDP_swab((__force __u32)n);
- else if (sbi->s_bytesex == BYTESEX_LE)
- return le32_to_cpu((__force __le32)n);
- else
- return be32_to_cpu((__force __be32)n);
-}
-
-static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
-{
- if (sbi->s_bytesex == BYTESEX_PDP)
- return (__force __fs32)PDP_swab(n);
- else if (sbi->s_bytesex == BYTESEX_LE)
- return (__force __fs32)cpu_to_le32(n);
- else
- return (__force __fs32)cpu_to_be32(n);
-}
-
-static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
-{
- if (sbi->s_bytesex == BYTESEX_PDP)
- *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
- else if (sbi->s_bytesex == BYTESEX_LE)
- le32_add_cpu((__le32 *)n, d);
- else
- be32_add_cpu((__be32 *)n, d);
- return *n;
-}
-
-static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
-{
- if (sbi->s_bytesex != BYTESEX_BE)
- return le16_to_cpu((__force __le16)n);
- else
- return be16_to_cpu((__force __be16)n);
-}
-
-static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
-{
- if (sbi->s_bytesex != BYTESEX_BE)
- return (__force __fs16)cpu_to_le16(n);
- else
- return (__force __fs16)cpu_to_be16(n);
-}
-
-static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
-{
- if (sbi->s_bytesex != BYTESEX_BE)
- le16_add_cpu((__le16 *)n, d);
- else
- be16_add_cpu((__be16 *)n, d);
- return *n;
-}
-
-#endif /* _SYSV_H */
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_SYSV_FS_H
-#define _LINUX_SYSV_FS_H
-
-#define __packed2__ __attribute__((packed, aligned(2)))
-
-
-#ifndef __KERNEL__
-typedef u16 __fs16;
-typedef u32 __fs16;
-#endif
-
-/* inode numbers are 16 bit */
-typedef __fs16 sysv_ino_t;
-
-/* Block numbers are 24 bit, sometimes stored in 32 bit.
- On Coherent FS, they are always stored in PDP-11 manner: the least
- significant 16 bits come last. */
-typedef __fs32 sysv_zone_t;
-
-/* 0 is non-existent */
-#define SYSV_BADBL_INO 1 /* inode of bad blocks file */
-#define SYSV_ROOT_INO 2 /* inode of root directory */
-
-
-/* Xenix super-block data on disk */
-#define XENIX_NICINOD 100 /* number of inode cache entries */
-#define XENIX_NICFREE 100 /* number of free block list chunk entries */
-struct xenix_super_block {
- __fs16 s_isize; /* index of first data zone */
- __fs32 s_fsize __packed2__; /* total number of zones of this fs */
- /* the start of the free block list: */
- __fs16 s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */
- sysv_zone_t s_free[XENIX_NICFREE]; /* first free block list chunk */
- /* the cache of free inodes: */
- __fs16 s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */
- sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */
- /* locks, not used by Linux: */
- char s_flock; /* lock during free block list manipulation */
- char s_ilock; /* lock during inode cache manipulation */
- char s_fmod; /* super-block modified flag */
- char s_ronly; /* flag whether fs is mounted read-only */
- __fs32 s_time __packed2__; /* time of last super block update */
- __fs32 s_tfree __packed2__; /* total number of free zones */
- __fs16 s_tinode; /* total number of free inodes */
- __fs16 s_dinfo[4]; /* device information ?? */
- char s_fname[6]; /* file system volume name */
- char s_fpack[6]; /* file system pack name */
- char s_clean; /* set to 0x46 when filesystem is properly unmounted */
- char s_fill[371];
- s32 s_magic; /* version of file system */
- __fs32 s_type; /* type of file system: 1 for 512 byte blocks
- 2 for 1024 byte blocks
- 3 for 2048 byte blocks */
-
-};
-
-/*
- * SystemV FS comes in two variants:
- * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2).
- * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4).
- */
-#define SYSV_NICINOD 100 /* number of inode cache entries */
-#define SYSV_NICFREE 50 /* number of free block list chunk entries */
-
-/* SystemV4 super-block data on disk */
-struct sysv4_super_block {
- __fs16 s_isize; /* index of first data zone */
- u16 s_pad0;
- __fs32 s_fsize; /* total number of zones of this fs */
- /* the start of the free block list: */
- __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */
- u16 s_pad1;
- sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */
- /* the cache of free inodes: */
- __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */
- u16 s_pad2;
- sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */
- /* locks, not used by Linux: */
- char s_flock; /* lock during free block list manipulation */
- char s_ilock; /* lock during inode cache manipulation */
- char s_fmod; /* super-block modified flag */
- char s_ronly; /* flag whether fs is mounted read-only */
- __fs32 s_time; /* time of last super block update */
- __fs16 s_dinfo[4]; /* device information ?? */
- __fs32 s_tfree; /* total number of free zones */
- __fs16 s_tinode; /* total number of free inodes */
- u16 s_pad3;
- char s_fname[6]; /* file system volume name */
- char s_fpack[6]; /* file system pack name */
- s32 s_fill[12];
- __fs32 s_state; /* file system state: 0x7c269d38-s_time means clean */
- s32 s_magic; /* version of file system */
- __fs32 s_type; /* type of file system: 1 for 512 byte blocks
- 2 for 1024 byte blocks */
-};
-
-/* SystemV2 super-block data on disk */
-struct sysv2_super_block {
- __fs16 s_isize; /* index of first data zone */
- __fs32 s_fsize __packed2__; /* total number of zones of this fs */
- /* the start of the free block list: */
- __fs16 s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */
- sysv_zone_t s_free[SYSV_NICFREE]; /* first free block list chunk */
- /* the cache of free inodes: */
- __fs16 s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */
- sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */
- /* locks, not used by Linux: */
- char s_flock; /* lock during free block list manipulation */
- char s_ilock; /* lock during inode cache manipulation */
- char s_fmod; /* super-block modified flag */
- char s_ronly; /* flag whether fs is mounted read-only */
- __fs32 s_time __packed2__; /* time of last super block update */
- __fs16 s_dinfo[4]; /* device information ?? */
- __fs32 s_tfree __packed2__; /* total number of free zones */
- __fs16 s_tinode; /* total number of free inodes */
- char s_fname[6]; /* file system volume name */
- char s_fpack[6]; /* file system pack name */
- s32 s_fill[14];
- __fs32 s_state; /* file system state: 0xcb096f43 means clean */
- s32 s_magic; /* version of file system */
- __fs32 s_type; /* type of file system: 1 for 512 byte blocks
- 2 for 1024 byte blocks */
-};
-
-/* V7 super-block data on disk */
-#define V7_NICINOD 100 /* number of inode cache entries */
-#define V7_NICFREE 50 /* number of free block list chunk entries */
-struct v7_super_block {
- __fs16 s_isize; /* index of first data zone */
- __fs32 s_fsize __packed2__; /* total number of zones of this fs */
- /* the start of the free block list: */
- __fs16 s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */
- sysv_zone_t s_free[V7_NICFREE]; /* first free block list chunk */
- /* the cache of free inodes: */
- __fs16 s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */
- sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */
- /* locks, not used by Linux or V7: */
- char s_flock; /* lock during free block list manipulation */
- char s_ilock; /* lock during inode cache manipulation */
- char s_fmod; /* super-block modified flag */
- char s_ronly; /* flag whether fs is mounted read-only */
- __fs32 s_time __packed2__; /* time of last super block update */
- /* the following fields are not maintained by V7: */
- __fs32 s_tfree __packed2__; /* total number of free zones */
- __fs16 s_tinode; /* total number of free inodes */
- __fs16 s_m; /* interleave factor */
- __fs16 s_n; /* interleave factor */
- char s_fname[6]; /* file system name */
- char s_fpack[6]; /* file system pack name */
-};
-/* Constants to aid sanity checking */
-/* This is not a hard limit, nor enforced by v7 kernel. It's actually just
- * the limit used by Seventh Edition's ls, though is high enough to assume
- * that no reasonable file system would have that much entries in root
- * directory. Thus, if we see anything higher, we just probably got the
- * endiannes wrong. */
-#define V7_NFILES 1024
-/* The disk addresses are three-byte (despite direct block addresses being
- * aligned word-wise in inode). If the most significant byte is non-zero,
- * something is most likely wrong (not a filesystem, bad bytesex). */
-#define V7_MAXSIZE 0x00ffffff
-
-/* Coherent super-block data on disk */
-#define COH_NICINOD 100 /* number of inode cache entries */
-#define COH_NICFREE 64 /* number of free block list chunk entries */
-struct coh_super_block {
- __fs16 s_isize; /* index of first data zone */
- __fs32 s_fsize __packed2__; /* total number of zones of this fs */
- /* the start of the free block list: */
- __fs16 s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */
- sysv_zone_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
- /* the cache of free inodes: */
- __fs16 s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */
- sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */
- /* locks, not used by Linux: */
- char s_flock; /* lock during free block list manipulation */
- char s_ilock; /* lock during inode cache manipulation */
- char s_fmod; /* super-block modified flag */
- char s_ronly; /* flag whether fs is mounted read-only */
- __fs32 s_time __packed2__; /* time of last super block update */
- __fs32 s_tfree __packed2__; /* total number of free zones */
- __fs16 s_tinode; /* total number of free inodes */
- __fs16 s_interleave_m; /* interleave factor */
- __fs16 s_interleave_n;
- char s_fname[6]; /* file system volume name */
- char s_fpack[6]; /* file system pack name */
- __fs32 s_unique; /* zero, not used */
-};
-
-/* SystemV/Coherent inode data on disk */
-struct sysv_inode {
- __fs16 i_mode;
- __fs16 i_nlink;
- __fs16 i_uid;
- __fs16 i_gid;
- __fs32 i_size;
- u8 i_data[3*(10+1+1+1)];
- u8 i_gen;
- __fs32 i_atime; /* time of last access */
- __fs32 i_mtime; /* time of last modification */
- __fs32 i_ctime; /* time of creation */
-};
-
-/* SystemV/Coherent directory entry on disk */
-#define SYSV_NAMELEN 14 /* max size of name in struct sysv_dir_entry */
-struct sysv_dir_entry {
- sysv_ino_t inode;
- char name[SYSV_NAMELEN]; /* up to 14 characters, the rest are zeroes */
-};
-
-#define SYSV_DIRSIZE sizeof(struct sysv_dir_entry) /* size of every directory entry */
-
-#endif /* _LINUX_SYSV_FS_H */
projects / thirdparty / linux.git / commitdiff
